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Pope Gregory XIII
Bishop of Rome
Diocese Rome
See Holy See
Papacy began 13 May 1572
Papacy ended 10 April 1585
Predecessor Pius V
Successor Sixtus V
Ordination c. 1558
Consecration 1558
Created Cardinal 12 March 1565
Personal details
Birth name Ugo Boncompagni
Born 7 January 1502
Bologna, Papal States
Died 10 April 1585 (aged 83)
Rome, Papal States
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  • Bishop of Vieste (1558–1560)
  • Legate to Spain (1565)
  • Prefect of the Apostolic Signatura (1565)
  • Cardinal-Priest of San Sisto Vecchio (1565–1572)
Motto Aperuit et clausit ("Opened and closed")
Coat of arms {{{coat_of_arms_alt}}}
Other Popes named Gregory

Pope Gregory XIII (Latin: Gregorius XIII; 7 January 1502 – 10 April 1585), born Ugo Boncompagni, was the head of the Catholic Church from 13 May 1572 to his death in 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally accepted civil calendar to this date.

Early life

Ugo Boncompagni was born in 1502, in Bologna.


Pope Paul IV appointed him Bishop of Viesti in 1558.


In 1564, he was made a cardinal by Pope Pius IV.


Cardinal Boncompagni was elected Pope at age 70; and he chose to be called Gregory XIII.

Pope Gregory was involved in Italian and European political disputes.

He founded the Gregorian University in Rome.

In the last year of his life, Gregory received an embassy from Japan.

Gregorian calendar

Pope Gregory is famous for his correction of mistakes in the Julian calendar. To accomplish the necessary changes, the Gregorian calendar skipped ten days between 4 October 1582 and 15 October 1582.

  • 1582 – Gregorian calendar reset, when 4 October was followed by 15 October.

Related pages

C o a Gregorio XIII
The Coat of Arms of Gregory XIII
Preceded by
Pius V
Succeeded by
Sixtus V

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