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The Gregorian calendar is the calendar used in most parts of the world. [1] [a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.
Pope Gregory I (Latin: Gregorius I; c. 540 – 12 March 604), commonly known as Saint Gregory the Great, was the 64th Bishop of Rome from 3 September 590 to his death. [1] [a] He is known for instituting the first recorded large-scale mission from Rome, the Gregorian mission, to convert the then largely pagan Anglo-Saxons to Christianity. [2]
Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582. [1] [2] The document, written in Latin, reformed the Julian calendar. The reform came to be regarded as a new calendar in its own right and came to be called the Gregorian calendar, which is used in most countries today.
Things named for Pope Gregory VII: The Gregorian Reform, a series of reforms initiated by Pope Gregory VII and the circle he formed in the papal curia, c. 1050–80, which dealt with the moral integrity and independence of the clergy; Things named for Pope Gregory XIII: Gregorian calendar, internationally the most widely used civil calendar ...
Detail of the tomb of Pope Gregory XIII celebrating the introduction of the Gregorian calendar. Pope Gregory XIII is best known for commissioning the Gregorian calendar , initially authored by the physician/astronomer Aloysius Lilius [ 6 ] [ 7 ] and aided by Jesuit priest/astronomer Christopher Clavius , who made the final modifications.
October 15: The day after October 4, 1582, is designated October 15 by order of Pope Gregory XIII June 21: Japanese warlord Oda Nobunaga assassinated in "incident at HonnÅ-ji" 1582 ( MDLXXXII ) was a common year starting on Monday in the Julian calendar , and a common year starting on Friday (link will display full calendar) of the Proleptic ...
Pope Gregory V (996–999) Pope Gregory VI (1045–1046) Antipope Gregory VI; Pope Gregory VII (1073–1085), after whom the Gregorian Reform is named; Pope Gregory VIII (1187) Antipope Gregory VIII; Pope Gregory IX (1227–1241) Pope Gregory X (1271–1276) Pope Gregory XI (1370–1378) Pope Gregory XII (1406–1415) Pope Gregory XIII (1572 ...
Plaque commemorating the popes buried in St. Peter's Basilica (their names in Latin and the year of their burial). This chronological list of popes of the Catholic Church corresponds to that given in the Annuario Pontificio under the heading "I Sommi Pontefici Romani" (The Roman Supreme Pontiffs), excluding those that are explicitly indicated as antipopes.