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Theodosius I
Golden coin depicting man with diadem facing right
Solidus depicting Theodosius, with the legend:
d n theodosius p f aug
("Our Lord Theodosius, pious, fortunate, august")
Roman emperor
Augustus 19 January 379 – 17 January 395
Predecessor Valens
Successor Arcadius (East)
Honorius (West)
Born 11 January 347
Cauca (Coca, Spain) or possibly Italica (near Santiponce, Spain)
Died 17 January 395 (aged 48)
Mediolanum (Milan, Italy)
Full name
Flavius Theodosius
Dynasty Theodosian
Father Count Theodosius
Mother Thermantia
Religion Nicene Christianity

Theodosius I (Greek: Θεοδόσιος Theodosios; 11 January 347 – 17 January 395), also called Theodosius the Great, was Roman emperor from 379 to 395. During his reign, he succeeded in a crucial war against the Goths, as well as in two civil wars, and was instrumental in establishing the creed of Nicaea as the orthodox doctrine for Christianity. Theodosius was the last emperor to rule the entire Roman Empire before its administration was permanently split between two separate courts (one western, the other eastern).

Born in Hispania, Theodosius was the son of a high-ranking general, Theodosius the Elder, under whose guidance he rose through the ranks of the Roman army. Theodosius held independent command in Moesia in 374, where he had some success against the invading Sarmatians. Not long afterwards, he was forced into retirement, and his father was executed under obscure circumstances. Theodosius soon regained his position following a series of intrigues and executions at Emperor Gratian's court. In 379, after the eastern Roman emperor Valens perished at the Battle of Adrianople against the Goths, Gratian appointed Theodosius as a successor with orders to take charge of the current military emergency. The new emperor's resources, and depleted armies, were not sufficient to drive the invaders out; in 382 the Goths were allowed to settle south of the Danube as autonomous allies of the empire. In 386, Theodosius signed a treaty with the Sasanian Empire which partitioned the long-disputed Kingdom of Armenia and secured a durable peace between the two powers.

Theodosius was a strong adherent of the Christian doctrine of consubstantiality and an opponent of Arianism. He convened a council of bishops at Constantinople in 381, which confirmed the former as orthodoxy and the latter as a heresy. Although Theodosius interfered little in the functioning of traditional pagan cults and appointed non-Christians to high offices, he failed to prevent or punish the damaging of several Hellenistic temples of classical antiquity, such as the Serapeum of Alexandria, by Christian zealots. During his earlier reign, Theodosius ruled the eastern provinces, while the west was overseen by the emperors Gratian and Valentinian II, whose sister he married. Theodosius sponsored several measures to improve his capital and main residence, Constantinople, most notably his expansion of the Forum Tauri, which became the biggest public square known in antiquity. Theodosius marched west twice, in 388 and 394, after both Gratian and Valentinian had been killed, to defeat the two pretenders, Magnus Maximus and Eugenius, who rose to replace them. Theodosius's final victory in September 394 made him master of the entire empire; he died a few months later and was succeeded by his two sons, Arcadius in the eastern half of the empire and Honorius in the west.

Theodosius was said to have been a diligent administrator, austere in his habits, merciful, and a devout Christian. For centuries after his death, Theodosius was regarded as a champion of Christian orthodoxy who decisively stamped out paganism. Modern scholars tend to see this as an interpretation of history by Christian writers more than an accurate representation of actual history. He is fairly credited with presiding over a revival in classical art that some historians have termed a "Theodosian renaissance". Although his pacification of the Goths secured peace for the Empire during his lifetime, their status as an autonomous entity within Roman borders caused problems for succeeding emperors. Theodosius has also received criticism for defending his own dynastic interests at the cost of two civil wars. His two sons proved weak and incapable rulers, and they presided over a period of foreign invasions and court intrigues, which heavily weakened the empire. The descendants of Theodosius ruled the Roman world for the next six decades, and the east–west division endured until the fall of the Western Empire in the late 5th century.


Theodosius was born in Hispania on 11 January, probably in the year 347. His father, also called Theodosius, was a successful and high-ranking general (magister equitum) under the western Roman emperor Valentinian I, and his mother was called Thermantia. The family appear to have been minor landed aristocrats in Hispania, although it is not clear if this social status went back several generations or if Theodosius the Elder was simply awarded land there for his military service. Their roots to Hispania were nevertheless probably long-standing, since various relatives of the future emperor Theodosius are likewise attested as Spanish, and Theodosius himself was ubiquitously associated in the ancient literary sources and panegyrics with the image of fellow Spanish-born emperor Trajan – though he never again visited the peninsula after becoming emperor.

Very little is recorded of the upbringing of Theodosius. The 5th-century author Theodoret claimed the future emperor grew up and was educated in his Iberian homeland, but his testimony is unreliable. One modern historian instead thinks Theodosius must have grown up among the army, participating in his father's campaigns throughout the provinces, as was customary at the time for families with a tradition of military service. One source says he received a decent education and developed a particular interest in history, which Theodosius then valued as a guide to his own conduct throughout life.


Illyricum & Dacia - AD 400
Theodosius was commander of the army in Moesia I in 374. His dismissal may have been connected to the accession of the emperor Valentinian II, which took place at Aquincum (Budapest) in nearby Pannonia Valeria, in 375.

Theodosius is first attested accompanying his father to Britain on his expedition in 368–369 to suppress the "Great Conspiracy", a concerted Celtic and Germanic invasion of the island provinces. After probably serving in his father's staff on further campaigns, Theodosius received his first independent command by 374 when he was appointed the dux (commanding officer) of the province of Moesia Prima in the Danube. In the autumn of 374, he successfully repulsed an incursion of Sarmatians on his sector of the frontier and forced them into submission. Not long afterwards, however, under mysterious circumstances, Theodosius's father suddenly fell from imperial favor and was executed, and the future emperor felt compelled to retire to his estates in Hispania.

Although these events are poorly documented, historians usually attribute this fall from grace to the machinations of a court faction led by Maximinus, a senior civilian official. According to another theory, the future emperor Theodosius lost his father, his military post, or both, in the purges of high officials that resulted from the accession of the 4-year-old emperor Valentinian II in November 375. Theodosius's period away from service in Hispania, during which he was said to have received threats from those responsible for his father's death, did not last long, however, as Maximinus, the probable culprit, was himself removed from power around April 376 and then executed. The emperor Gratian immediately began replacing Maximinus and his associates with relatives of Theodosius in key government positions, indicating the family's full rehabilitation, and by 377 Theodosius himself had regained his command against the Sarmatians.

Theodosius's renewed term of office seems to have gone uneventfully, until news arrived that the eastern Roman emperor, Valens, had been killed at the Battle of Adrianople in August 378 against invading Goths. The disastrous defeat left much of Rome's military leadership dead, discredited, or barbarian in origin, to the result that Theodosius, notwithstanding his own modest record, became the establishment's choice to replace Valens and assume control of the crisis. With the begrudging consent of the western emperor Gratian, Theodosius was formally invested with the purple by a council of officials at Sirmium on 19 January 379.


Bust of Theodosius I
Head found near statue base dedicated to Theodosius, in the ancient city of Aphrodisias (Aydın, Turkey)
Roman empire 395
The administrative divisions of the Roman Empire in 395, under Theodosius I.
Valentinianus Solidus 621120
Solidus of Valentinian II showing Valentinian II and Theodosius I on the reverse, each holding a mappa

War against the Goths (379–382)

The immediate problem facing Theodosius upon his accession was how to check the bands of Goths that were laying waste to the Balkans, with an army that had been severely depleted of manpower following the debacle at Adrianople. The western emperor Gratian, who seems to have provided only little immediate assistance, surrendered to Theodosius control of the prefecture of Illyricum for the duration of the conflict, giving his new colleague full charge the war effort. Theodosius implemented stern and desperate recruiting measures, resorting to the conscription of farmers and miners. Punishments were instituted for harboring deserters and furnishing unfit recruits. Theodosius also admitted large numbers of non-Roman auxiliaries into the army, even Gothic deserters from beyond the Danube. Some of these foreign recruits were exchanged with more reliable Roman garrison troops stationed in Egypt.

Throughout the second half of 379, Theodosius and his generals, based at Thessalonica, won some minor victories over individual bands of raiders, but suffered at least one serious defeat in 380, which was blamed on the treachery of the new barbarian recruits. During the autumn of 380, a life-threatening illness, from which Theodosius recovered, prompted him to request baptism. Some obscure victories were recorded in official sources around this time, however, and, in November 380, the military situation was found to be sufficiently stable for Theodosius to move his court to Constantinople. There, the emperor enjoyed a propaganda victory when, in January 381, he received the visit and submission of a minor Gothic leader, Athanaric. By this point, however, Theodosius seems to have no longer believed that the Goths could be completely ejected from Roman territory. After Athanaric died that very same month, the emperor gave him a funeral with full honors, impressing his entourage and signaling to the enemy that the Empire was disposed to negotiate terms. During the campaigning season of 381, reinforcements from Gratian drove the Goths out of Macedonia and Thessaly into Thrace, while, in the latter sector, Theodosius or one of his generals repulsed an incursion by a group of Sciri and Huns across the Danube.

Following negotiations which likely lasted at least several months, the Romans and Goths finally concluded a settlement on 3 October 382. In return for military service to Rome, the Goths were allowed to settle some tracts of Roman land south of the Danube. The terms were unusually favorable to the Goths, reflecting the fact that they were entrenched in Roman territory and had not been driven out. Namely, instead of fully submitting to Roman authority, they were allowed to remain autonomous under their own leaders, and thus remaining a strong, unified body. The Goths now settled within the Empire would largely fight for the Romans as a national contingent, as opposed to being fully integrated into the Roman forces.

The Roman Empire ca 400 AD (Danube provinces)
Roman provinces along the Ister (Danube), showing the Roman dioceses of Thrace, Dacia, Pannonia and Italia Annonaria on the empire's northern frontier


Solidus of Theodosius, showing both him and his co-emperor Valentinian II (r. 375 – 392) enthroned on the reverse, each crowned by Victory and together holding an orb victoria augg ("the Victory of the Augusti")

According to the Chronicon Paschale, Theodosius celebrated his quinquennalia on 19 January 383 at Constantinople; on this occasion he raised his eldest son Arcadius to co-emperor (augustus). Sometime in 383, Gratian's wife Constantia died. Gratian remarried, wedding Laeta, whose father was a consularis of Roman Syria. Early 383 saw the acclamation of Magnus Maximus as emperor in Britain and the appointment of Themistius as praefectus urbi in Constantinople. On the 25 August 383, according to the Consularia Constantinopolitana, Gratian was killed at Lugdunum (Lyon) by Andragathius, the magister equitum of the rebel emperor during the rebellion of Magnus Maximus. Constantia's body arrived in Constantinople on 12 September that year and was buried in the Church of the Holy Apostles on 1 December. Gratian was deified as Latin: [Divus Gratianus] Error: {{Lang}}: text has italic markup (help).

Theodosius, unable to do much about Maximus due to ongoing military inadequacy, opened negotiations with the Persian emperor Shapur III (r. 383 – 388) of the Sasanian Empire. According to the Consularia Constantinopolitana, Theodosius received in Constantinople an embassy from them in 384.

In an attempt to curb Maximus's ambitions, Theodosius appointed Flavius Neoterius as praetorian prefect of Italy. In the summer of 384, Theodosius met his co-emperor Valentinian II in northern Italy. Theodosius brokered a peace agreement between Valentinian and Magnus Maximus which endured for several years.

Theodosius I was based in Constantinople, and according to Peter Heather, wanted, "for his own dynastic reasons (for his two sons each eventually to inherit half of the empire), refused to appoint a recognized counterpart in the west. As a result he was faced with rumbling discontent there, as well as dangerous usurpers, who found plentiful support among the bureaucrats and military officers who felt they were not getting a fair share of the imperial cake."

Middle reign: 384–387

Theodosius's second son Honorius was born on 9 December 384 and titled nobilissimus puer (or nobilissimus iuvenis). The death of Aelia Flaccilla, Theodosius's first wife and the mother of Arcadius, Honorius, and Pulcheria, occurred by 386. She died at Scotumis in Thrace and was buried at Constantinople, her funeral oration delivered by Gregory of Nyssa. A statue of her was dedicated in the Byzantine Senate. In 384 or 385, Theodosius's niece Serena was married to the magister militum, Stilicho.

In the beginning of 386, Theodosius's daughter Pulcheria also died. That summer, more Goths were defeated, and many were settled in Phrygia. According to the Consularia Constantinopolitana, a Roman triumph over the Gothic Greuthungi was then celebrated at Constantinople. The same year, work began on the great triumphal column in the Forum of Theodosius in Constantinople, the Column of Theodosius. The Consularia Constantinopolitana records that on 19 January 387, Arcadius celebrated his quinquennalia in Constantinople. By the end of the month, there was an uprising or riot in Antioch (modern Antakya). The Roman–Persian Wars concluded with the signing of the Peace of Acilisene with Persia. By the terms of the agreement, the ancient Kingdom of Armenia was divided between the powers.

By the end of the 380s, Theodosius and the court were in Milan and northern Italy had settled down to a period of prosperity. Peter Brown says gold was being made in Milan by those who owned land as well as by those who came with the court for government service. Great landowners took advantage of the court's need for food, "turning agrarian produce into gold", while repressing and misusing the poor who grew it and brought it in. According to Brown, modern scholars link the decline of the Roman empire to the avarice of the rich of this era. He quotes Paulinus of Milan as describing these men as creating a court where "everything was up for sale". In the late 380s, Ambrose, the bishop of Milan took the lead in opposing this, presenting the need for the rich to care for the poor as "a necessary consequence of the unity of all Christians". This led to a major development in the political culture of the day called the “advocacy revolution of the later Roman empire". This revolution had been fostered by the imperial government, and it encouraged appeals and denunciations of bad government from below. However, Brown adds that, "in the crucial area of taxation and the treatment of fiscal debtors, the late Roman state [of the 380s and 390s] remained impervious to Christianity".

Civil war: 387–388

The peace with Magnus Maximus was broken in 387, and Valentinian escaped to the east with Justina, reaching Thessalonica (Thessaloniki) in summer or autumn 387 and appealing to Theodosius for aid; Valentinian II's sister Galla was then married to the eastern emperor at Thessalonica in late autumn. Theodosius may still have been in Thessalonica when he celebrated his decennalia on 19 January 388. Theodosius was consul for the second time in 388. Galla and Theodosius's first child, a son named Gratian, was born in 388 or 389. In summer 388, Theodosius recovered Italy from Magnus Maximus for Valentinian, and in June, the meeting of Christians deemed heretics was banned by Valentinian.

The armies of Theodosius and Maximus fought at the Battle of Poetovio in 388, which saw Maximus defeated. On 28 August 388 Maximus was executed. Now the de facto ruler of the Western empire as well, Theodosius celebrated his victory in Rome on June 13, 389 and stayed in Milan until 391, installing his own loyalists in senior positions including the new magister militum of the West, the Frankish general Arbogast. According to the Consularia Constantinopolitana, Arbogast killed Flavius Victor (r. 384 – 388), Magnus Maximus's young son and co-emperor, in Gaul in August/September that year. Damnatio memoriae was pronounced against them, and inscriptions naming them were erased.

Massacre and its aftermath: 388–391

Massacre in the Hippodrome of Thessaloniki in 390, 16th century wood engraving
Massacre in the Hippodrome of Thessaloniki in 390, 16th-century wood engraving

The Massacre of Thessalonica (Thessaloniki) in Greece was a massacre of local civilians by Roman troops. The best estimate of the date is April of 390. The massacre was most likely a response to an urban riot that led to the murder of a Roman official.

Anthonis van Dyck 005
Anthonis Van Dyke's 1619 painting of St. Ambrose blocking the cathedral door, refusing Theodosius' admittance, a "pious fiction" invented by Theodoret.

Theodosius was not in Thessalonica when the massacre occurred. The court was in Milan. According to the early twentieth century historian Henry Smith Williams, history's assessment of Theodosius' character has been stained by the massacre of Thessalonica for centuries.

Second civil war: 392–394

In 391, Theodosius left his trusted general Arbogast, who had served in the Balkans after Adrianople, to be magister militum for the Western emperor Valentinian II, while Theodosius attempted to rule the entire empire from Constantinople. On 15 May 392, Valentinian II died at Vienna in Gaul (Vienne). Valentinian had quarrelled publicly with Arbogast. Stephen Williams asserts that Valentinian's death left Arbogast in "an untenable position". He had to carry on governing without the ability to issue edicts and rescripts from a legitimate acclaimed emperor. Arbogast was unable to assume the role of emperor himself because of his non-Roman background. Instead, on 22 August 392, Arbogast had Valentinian's master of correspondence, Eugenius, proclaimed emperor in the West at Lugdunum.

At least two embassies went to Theodosius to explain events, one of them Christian in make-up, but they received ambivalent replies, and were sent home without achieving their goals. Theodosius raised his second son Honorius to emperor on 23 January 393, implying the illegality of Eugenius' rule. Williams and Friell say that by the spring of 393, the split was complete, and "in April Arbogast and Eugenius at last moved into Italy without resistance". Flavianus, the praetorian prefect of Italy whom Theodosius had appointed, defected to their side. Through early 394, both sides prepared for war.

Theodosius gathered a large army, including the Goths whom he had settled in the eastern empire as foederati, and Caucasian and Saracen auxiliaries, and marched against Eugenius. The battle began on 5 September 394, with Theodosius' full frontal assault on Eugenius's forces. Thousands of Goths died, and in Theodosius's camp, the loss of the day decreased morale. It is said by Theodoret that Theodosius was visited by two "heavenly riders all in white" who gave him courage.

The next day, the extremely bloody battle began again and Theodosius's forces were aided by a natural phenomenon known as the Bora, which can produce hurricane-strength winds. The Bora blew directly against the forces of Eugenius and disrupted the line. Eugenius's camp was stormed; Eugenius was captured and soon after executed. According to Socrates Scholasticus, Theodosius defeated Eugenius at the Battle of the Frigidus (the Vipava) on 6 September 394. On 1 January 395, Honorius arrived in Mediolanum and a victory celebration was held there. At the end of April 394, Theodosius's wife Galla had died while he was away at war.

A number of Christian sources report that Eugenius cultivated the support of the pagan senators by promising to restore the altar of Victory and provide public funds for the maintenance of cults if they would support him and if he won the coming war against Theodosius. Cameron notes that the ultimate source for this is Ambrose's biographer Paulinus the Deacon, whom he argues fabricated the entire narrative and deserves no credence. Historian Michele Renee Salzman explains that "two newly relevant texts – John Chrysostom's Homily 6, adversus Catharos (PG 63: 491–492) and the Consultationes Zacchei et Apollonii, re-dated to the 390s, reinforces the view that religion was not the key ideological element in the events at the time". According to Maijastina Kahlos, Finnish historian and Docent of Latin language and Roman literature at the University of Helsinki, the notion of pagan aristocrats united in a "heroic and cultured resistance" who rose up against the ruthless advance of Christianity in a final battle near Frigidus in 394 is a romantic myth.


Theodosius suffered from a disease involving severe edema. He died in Mediolanum (Milan) on 17 January 395, and his body lay in state in the palace there for forty days. His funeral was held in the cathedral on 25 February. Bishop Ambrose delivered a panegyric titled De obitu Theodosii in the presence of Stilicho and Honorius in which Ambrose praised the suppression of paganism by Theodosius.

On 8 November 395, his body was transferred to Constantinople, where according to the Chronicon Paschale he was buried in the Church of the Holy Apostles. He was deified Latin: [Divus Theodosius] Error: {{Lang}}: text has italic markup (help). He was interred in a porphyry sarcophagus that was described in the 10th century by Constantine VII Porphyrogenitus in his work De Ceremoniis.


Theodosius was initially styled "the Great" simply as a way to differentiate him from his grandson Theodosius II. Later, at the Council of Chalcedon in 451, the honorific was deemed merited due to his promotion of Nicene Christianity.


Theodosius the Great is venerated in Eastern and Oriental Orthodox Churches:

  • 18 January – Ethiopian Church commemorates Theodosius, the righteous emperor,
  • 18 January – Eastern Orthodox Church commemoration,
  • 19 January – Armenian Apostolic Church,

Emperor (king) Theodosius is commemorated in armenian anaphora with saint kings: Abgar, Constantine and Tiridates.

In Eastern Orthodox Church he is commemorated as ktetor of Vatopedi and donator of Vatopedi icon of the Mother of God.

Art patronage

Disco de Teodosio
Missorium of Theodosius, found in 1847 in Almendralejo, Spain
Hippodrome Constantinople 2007 003
View of the Hippodrome of Constantinople with the surviving Obelisk of Theodosius
The Obelisk of Theodosius, details of the base of the Obelisk of Thutmose III, Hippodrome, Istanbul (8370192180)
The Obelisk of Theodosius, details of the base of the Obelisk of Thutmose III, Hippodrome, Istanbul (8370192180)

According to art historian David Wright, art of the era around the year 400 reflects optimism amongst the traditional polytheists. This is likely connected to what Ine Jacobs calls a renaissance of classical styles of art in the Theodosian period (AD 379- 395) often referred to in modern scholarship as the Theodosian renaissance. The Forum Tauri in Constantinople was renamed and redecorated as the Forum of Theodosius, including a column and a triumphal arch in his honour. The missorium of Theodosius, the city of Aprodisias' statue of the emperor, the base of the Obelisk of Theodosius, the columns of Theodosius and Arcadius, and the diptych of Probus were all commissioned by the court and reflect a similar renaissance of classicism.

According to Armin Wirsching, two obelisks were shipped by the Romans from Karnak to Alexandria in 13/12 BC. In 357, Constantius II had one (that became known as the Lateran obelisk) shipped to Rome. Wirsching says the Romans had previously watched and learned from the Egyptians how to transport such large heavy objects, so they constructed "a special sea‐going version of the Nile vessels ... – a double‐ship with three hulls". In 390, Theodosius oversaw the removal of the other to Constantinople.Linda Safran says that relocating the obelisk was motivated by Theodosius' victory over "the tyrants" (most likely Maximus Magnus and his son Victor). It is now known as the obelisk of Theodosius and still stands in the Hippodrome of Constantinople, the long Roman circus that was, at one time, the centre of Constantinople's public life. Re-erecting the monolith was a challenge for the technology that had been honed in the construction of siege engines.

The obelisk's white marble base is entirely covered with bas-reliefs documenting Theodosius' imperial household and the engineering feat of removing the obelisk to Constantinople. Theodosius and the imperial family are separated from the nobles among the spectators in the imperial box, with a cover over them as a mark of their status. From the perspective of style, it has served as "the key monument in identifying a so-called Theodosian court style, which is usually described as a "renaissance" of earlier Roman classicism".

Theodosius colum, Istanbul
Theodosius offers a laurel wreath to the victor, on the marble base of the Obelisk of Thutmosis III at the Hippodrome of Constantinople.

Religious policy

Arianism and orthodoxy

The Arian controversy, a dispute concerning the nature of the divine trinity, and its accompanying struggles for political influence, started in Alexandria before the reign of Constantine the Great between a presbyter, Arius of Alexandria, and his bishop, Alexander of Alexandria. When Alexander died, his successor, Athanasius, became the representative of orthodoxy.

Arius asserted that God the Father created the Son. This meant the Son, though still seen as divine, was not equal to the Father, because he had a beginning, and was not eternal. Father and Son were, therefore, similar but not of the same essence. This Christology quickly spread through Egypt and Libya and the other Roman provinces. Bishops engaged in "wordy warfare," and the people divided into parties, sometimes demonstrating in the streets in support of one side or the other.

Constantine had tried to settle the issues at the Council of Nicaea, but as Arnold Hugh Martin Jones states: "The rules laid down at Nicaea were not universally accepted". After the Nicene Creed was formulated in 325, many in the church reacted strongly against the word "homoousios" in the Creed, and therefore Councils at Ariminum (Rimini), Nike (southeast of Adrianople), and Constantinople, held in 359–60 by Emperor Constantius II, formulated creeds that were intended to replace or revise the Nicene Creed; in particular, to find alternatives for "homoousios." These councils are no longer regarded as Ecumenical Councils in the tradition of the Church; their creeds, which are at odds with the Nicene Creed, are known as Arian Creeds.

During this time, Athanasius was at the center of the controversy and became the "champion of orthodoxy" after Alexander died. To Athanasius, Arius' interpretation of Jesus' nature (Homoiousian), that the Father and Son are similar but not identical in substance, could not explain how Jesus could accomplish the redemption of humankind which is the foundational principle of Christianity. "According to Athanasius, God had to become human so that humans could become divine ... That led him to conclude that the divine nature in Jesus was identical to that of the Father, and that Father and Son have the same substance" (homoousios). Athanasius' teaching was a major influence in the West, especially on Theodosius I.

On 28 February 380, Theodosius issued the Edict of Thessalonica, a decree addressed to the city of Constantinople, determining that only Christians who believed in the consubstantiality of God the Father, Son and Holy Spirit could style themselves "catholic" and have their own places of worship officially recognized as "churches"; deviants were labeled heretics and described as "out of their minds and insane".

Recent scholarship has tended to reject former views that the edict was a key step in establishing Christianity as the official religion of the Empire, since it was aimed exclusively at Constantinople and seems to have gone largely unnoticed by contemporaries outside the capital. For example, German ancient historian Karl Leo Noethlichs [de] writes that the Edict of Thessalonica was neither anti-pagan nor antisemitic; it did not declare Christianity to be the official religion of the empire; and it gave no advantage to Christians over other faiths. It is clear from mandates issued in the years after 380 that Theodosius had made no requirement for pagans or Jews to convert to Christianity. Nonetheless, the edict is the first known secular Roman law to positively define a religious orthodoxy.

According to Robinson Thornton, Theodosius began taking steps to repress Arianism immediately after his baptism in 380. On 26 November 380, two days after he had arrived in Constantinople, Theodosius expelled the Homoian bishop, Demophilus of Constantinople, and appointed Meletius patriarch of Antioch, and Gregory of Nazianzus, one of the Cappadocian Fathers from Cappadocia (today in Turkey), patriarch of Constantinople. Theodosius had just been baptized, by bishop Ascholius of Thessalonica, during a severe illness.

In May 381, Theodosius summoned a new ecumenical council at Constantinople to repair the schism between East and West on the basis of Nicene orthodoxy. The council went on to define orthodoxy, including the Third Person of the Trinity, the Holy Spirit, as equal to the Father and 'proceeding' from Him. The council also "condemned the Apollonarian and Macedonian heresies, clarified jurisdictions of the bishops according to the civil boundaries of dioceses, and ruled that Constantinople was second in precedence to Rome."

Policy towards paganism

Theodosius seems to have adopted a cautious policy toward traditional non-Christian cults, reiterating his Christian predecessors' bans on animal sacrifice, divination, and apostasy, while allowing other pagan practices to be performed publicly and temples to remain open. He also voiced his support for the preservation of temple buildings, but nonetheless failed to prevent the damaging of many holy sites, images and objects of piety by Christian zealots, some including even his own officials. Theodosius also turned pagan holidays into workdays, but the festivals associated with them continued. A number of laws against paganism were issued towards the end of his reign, in 391 and 392, but historians have tended to downplay their practical effects and even the emperor's direct role in them. Modern scholars think there is little if any evidence Theodosius pursued an active and sustained policy against the traditional cults.

There is evidence that Theodosius took care to prevent the empire's still substantial pagan population from feeling ill-disposed toward his rule. Following the death in 388 of his praetorian prefect, Cynegius, who had vandalized a number of pagan shrines in the eastern provinces, Theodosius replaced him with a moderate pagan who subsequently moved to protect the temples. During his first official tour of Italy (389–391), the emperor won over the influential pagan lobby in the Roman Senate by appointing its foremost members to important administrative posts. Theodosius also nominated the last pair of pagan consuls in Roman history (Tatianus and Symmachus) in 391.

Temple destruction

Contemporary archaeology has found that the area with the most destruction against temples by Christians took place in the territory around Constantinople in the diocese of Orientis (the East) under Theodosius' prefect, Maternus Cynegius, where archaeological digs have discovered several destroyed temples. Theodosius officially supported temple preservation, but Garth Fowden says Cynegius did not limit himself to Theodosius' official policy, but instead, commissioned temple destruction on a wide scale, even employing the military under his command for this purpose. Christopher Haas also says Cynegius oversaw temple closings, the prohibition of sacrifices, and the destruction of temples in Osrhoene, Carrhae, and Beroea.

Earlier scholars believed Cynegius' actions were just part of a tide of violence against temples that continued throughout the 390s. However, recent archaeological discoveries have undermined this view. The archaeological evidence for the violent destruction of temples in the fourth and early fifth centuries around the entire Mediterranean is limited to a handful of sites. Temple destruction is attested to in 43 cases in the written sources, but only 4 of them were confirmed by archaeological evidence. Trombley and MacMullen say part of what creates this discrepancy are details in the historical sources that are commonly ambiguous and unclear. For example, Malalas claimed Constantine destroyed all the temples, then he said Theodosius did, then he said Constantine converted them all to churches. There is no evidence of any desire on the part of the emperor to institute a systematic destruction of temples anywhere in the Theodosian Code, and no evidence in the archaeological record that extensive temple destruction ever took place.

Theodosian decrees

According to The Cambridge Ancient History, the Theodosian Law Code is a set of laws, originally dated from Constantine to Theodosius I, that were gathered together, organized by theme, and reissued throughout the empire between 389 and 391. Jill Harries and Ian S. Wood explain that, in their original forms, these laws were created by different emperors and governors to resolve the issues of a particular place at a particular time. They were not intended as general laws. Local politics and culture had produced divergent attitudes, and as a result, these laws present a series of conflicting opinions: for example, some laws called for the complete destruction of the temples and others for their preservation. French historian of Antiquity, Philippe Fleury [fr], observes that Ammianus Marcellinus says this legal complexity produced corruption, forgery of rescripts, falsified appeals, and costly judicial delays.

The Theodosian Law Code has long been one of the principal historical sources for the study of Late Antiquity. Gibbon described the Theodosian decrees, in his Memoires, as a work of history rather than jurisprudence. Brown says the language of these laws is uniformly vehement, and penalties are harsh and frequently horrifying, leading some historians, such as Ramsay MacMullen, to see them as a 'declaration of war' on traditional religious practices. It is a common belief the laws marked a turning point in the decline of paganism.

Yet, many contemporary scholars such as Lepelly, Brown and Cameron, question the use of the Code, a legal document, not an actual historical work, for understanding history. One of many problems with using the Theodosian Code as a record of history is described by archaeologists Luke Lavan and Michael Mulryan. They explain that the Code can be seen to document "Christian ambition" but not historic reality. The overtly violent fourth century that one would expect to find from taking the laws at face value is not supported by archaeological evidence from around the Mediterranean.

End of paganism

The picture of Theodosius as "the most pious emperor", who presided over the end of paganism through the aggressive application of law and coercion – a view which R. Malcolm Errington says "has dominated the European historical tradition almost to this day" – was first written by Theodoret who, in Errington's view, had a habit of ignoring facts and cherry picking. In the centuries following his death, Theodosius gained a reputation as the champion of orthodoxy and the vanquisher of paganism, but modern historians see this as a later interpretation of history by Christian writers rather than actual history.

An increase in the variety and abundance of sources has brought about the reinterpretation of religion of this era. According to Salzman: "Although the debate on the death of paganism continues, scholars and large, concur that the once dominant notion of overt pagan-Christian religious conflict cannot fully explain the texts and artifacts or the social, religious, and political realities of Late Antique Rome".

Scholars agree that Theodosius gathered copious legislation on religious subjects, and that he continued the practices of his predecessors, prohibiting sacrifices with the intent of divining the future in December of 380, issuing a decree against heretics on 10 January 381, and an edict against Manichaeism in May of that same year. Theodosius convened the First Council of Constantinople, the second ecumenical council after Constantine's First Council of Nicaea in 325; and the Constantinopolitan council which ended on 9 July. What is important about this, according to Errington, is how much this 'copious legislation' was applied and used, which would show how dependable it is as a reflection of actual history.

Brown asserts that Christians still comprised a minority of the overall population, and local authorities were still mostly pagan and lax in imposing anti-pagan laws; even Christian bishops frequently obstructed their application. Harries and Wood say, "The contents of the Code provide details from the canvas but are an unreliable guide, in isolation, to the character of the picture as a whole". Previously undervalued similarities in language, society, religion, and the arts, as well as current archaeological research, indicate paganism slowly declined, and that it was not forcefully overthrown by Theodosius I in the fourth century.

Maijastina Kahlos writes that the fourth century Roman empire contained a wide variety of religions, cults, sects, beliefs and practices and they all generally co-existed without incident. Coexistence did occasionally lead to violence, but such outbreaks were relatively infrequent and localized. Jan N. Bremmer says that "religious violence in Late Antiquity is mostly restricted to violent rhetoric: 'in Antiquity, not all religious violence was that religious, and not all religious violence was that violent'".

The Christian church believed that victory over "false gods" had begun with Jesus and was completed through the conversion of Constantine; it was a victory that took place in heaven, rather than on earth, since Christians were only about 15–18% of the empire's population in the early 300s. Brown indicates that, as a result of this "triumphalism," paganism was seen as vanquished, and Salzman adds that judging by the sheer number of laws, heresy was a much higher priority than paganism for Christians in the fourth and fifth centuries.

There are many signs that a healthy paganism continued into the fifth century, and in some places, into the sixth and beyond. Archaeology indicates that in most regions away from the imperial court, the end of paganism was both gradual and untraumatic.

While conceding that Theodosius's reign may have been a watershed in the decline of the old religions, Cameron downplays the role of the emperor's 'copious legislation' as limited in effect, and writes that Theodosius did 'certainly not' ban paganism. In his 2020 biography of Theodosius, Mark Hebblewhite concludes that Theodosius never saw or advertised himself as a destroyer of the old cults; rather, the emperor's efforts to promote Christianity were cautious, 'targeted, tactical, and nuanced', and intended to prevent political instability and religious discord.

See also

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