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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.
After Pope Pius V (1566–1572) died, the conclave chose Cardinal Boncompagni, who assumed the name of Gregory XIII in homage to Gregory the Great, a 6th-century reforming pope. It was a very brief conclave, lasting less than 24 hours.
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.
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 ...
Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752. In Great Britain, the term "New Style" was used for the calendar and the Act omits any acknowledgement of Pope Gregory: the Annexe to the Act established a computation for the date of Easter that achieved the same result as Gregory's rules, without actually referring to him.
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]
Pope Gregory III (731–741) Pope Gregory IV (827–844) 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 ...
^a On 18 May 2020, Pope Francis inscribed Saint Faustina Kowalska, Virgin, in the General Roman Calendar. [22] ^b On 29 May 2014, Pope Francis inscribed Saint John XXIII, Pope, in the General Roman Calendar. [23] ^c On 29 May 2014, Pope Francis inscribed Saint John Paul II, Pope, in the General Roman Calendar. [23]