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40 facts for kids

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Millennium: 1st millennium
Centuries: 1st century BC1st century2nd century
Decades: 10s  20s  30s  – 40s –  50s  60s  70s
Years: 37 38 394041 42 43
40 in other calendars
Gregorian calendar 40
Ab urbe condita 793
Armenian calendar N/A
Assyrian calendar 4790
Bahá'í calendar -1804–-1803
Bengali calendar -553
Berber calendar 990
English Regnal year N/A
Buddhist calendar 584
Burmese calendar -598
Byzantine calendar 5548–5549
Chinese calendar 己亥年十一月廿八日
— to —
Coptic calendar -244–-243
Ethiopian calendar 32–33
Hebrew calendar 3800–3801
Hindu calendars
 - Vikram Samvat 96–97
 - Shaka Samvat N/A
 - Kali Yuga 3141–3142
Holocene calendar 10040
Iranian calendar 582 BP – 581 BP
Islamic calendar 600 BH – 599 BH
Japanese calendar
Korean calendar 2373
Minguo calendar 1872 before ROC
Thai solar calendar 583

Year 40 (XL) was a leap year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus without colleague.


Roman Empire

  • The emperor Caligula is consul without colleague.
  • Caligula starts a campaign to conquer Britain. It fails miserably. He names himself the winner.
  • Noricum and Mauretania are added into the Roman Empire.
  • Caligula reforms the principatus into a Hellenistic Autocracy. He distributes honors carelessly, declares himself a god and orders that all the heads of the Greek deity statues be replaced by his. According to legend, this is when he appointed his horse, Incitatus, a senator.
  • Approximate date of start of construction on the Pont du Gard aqueduct in Gallia Narbonensis.
  • Philo teaches that all men are born free.
  • An early Christian church is erected at Corinth (most probable date).


  • The Germanic Quadi tribe begin settling in present-day Moravia and Slovakia.


  • Vardanes I becomes king of Parthia. He was opposed by his brother Gotarzes II.
  • The Vietnamese Trung sisters rebel against the rule of the Chinese Emperor Guangwu of Han.




  • January – Gnaeus Domitius Ahenobarbus, husband of Agrippina the younger, brother-in-law of Caligula (b. 17 BC)
  • Ptolemy of Mauretania (b. 1 BC)
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