Pope Gregory XIII

Pope Gregory XIII
Bishop of Rome
Portrait by Bartolomeo Passarotti (c. 1586, Friedenstein Palace, Gotha)
Church	Catholic Church
Papacy began	13 May 1572
Papacy ended	10 April 1585
Predecessor	Pius V
Successor	Sixtus V
Previous post(s)	Bishop of Vieste (1558–1560) Legate to Spain (1565) Prefect of the Apostolic Signatura (1565) Cardinal-Priest of San Sisto Vecchio (1565–1572)
Orders
Ordination	31 July 1558 by Girolamo Maccabei
Consecration	6 August 1558 by Girolamo Maccabei
Created cardinal	12 March 1565 by Pius IV
Personal details
Born	Ugo Boncompagni 7 January 1502[a] Bologna, Papal States
Died	10 April 1585 (aged 83) Rome, Papal States
Alma mater	University of Bologna
Motto	Aperuit et clausit ("Opened and closed")
Signature
Coat of arms
Other popes named Gregory

Papal styles of Pope Gregory XIII
Reference style	His Holiness
Spoken style	Your Holiness
Religious style	Holy Father
Posthumous style	None

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