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Pope Gregory XIII

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Gregory XIII
Papacy began13 May 1572
Papacy ended10 April 1585
PredecessorPope Pius V
SuccessorPope Sixtus V
Personal details
Birth nameUgo Boncompagni
BornJanuary 7, 1502(1502-01-07)
Bologna, Papal States
Died10 April 1585(1585-04-10) (aged 83)
Rome, Papal States
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.[1]


Pope Paul IV appointed him Bishop of Viesti in 1558.[1]


In 1564, he was made a cardinal by Pope Pius IV.[1]


Cardinal Boncompagni was elected Pope at age 70;[2] and he chose to be called Gregory XIII.

Pope Gregory was involved in Italian and European political disputes.[1]

He founded the Gregorian University in Rome.[3]

In the last year of his life, Gregory received an embassy from Japan.[2]

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[4]

  • 1582 – Gregorian calendar reset, when October 4th was followed by October 15th[5]

Related pages


The Coat of Arms of Gregory XIII
  1. 1.0 1.1 1.2 1.3 "Pope Gregory XIII," Catholic Encyclopedia; retrieved 2011-11-3.
  2. 2.0 2.1 Society for the Diffusion of Useful Knowledge. (1838). "Gregory XIII," Penny cyclopaedia, Vol. 11, p. 446.
  3. "Gregory XIII (1502-1585)," Who's Who in Christianity; retrieved 2012-7-18.
  4. Society for the Diffusion of Useful Knowledge. (1839). "Kalendar," Penny cyclopaedia, Vol. 13, p. 172.
  5. St. Peter's Basilica, Monument to Gregory XIII; retrieved 2011-11-10.

Other websites

Media related to Gregorius XIII at Wikimedia Commons

Preceded by
Pius V
Succeeded by
Sixtus V