The Gregorian calendar was a reform of the Julian calendar instituted in 1582 by Pope Gregory XIII, after whom the calendar was named, by papal bull Inter gravissimas dated 24 February 1582. The motivation for the adjustment was to bring the date for the celebration of Easter to the time of year in which it was celebrated when it was introduced by the early Church. Although a recommendation of the First Council of Nicaea in 325 specified that all Christians should celebrate Easter on the same day, it took almost five centuries before virtually all Christians achieved that objective by adopting the rules of the Church of Alexandria (see Easter for the issues which arose). COUNT 5
QSN1 Who revised the Julian calendar? ANS1 Pope Gregory XIII QSN2 When was the Gregorian Calendar introduced? ANS2 1582 QSN3 What calendar was used in the reform to create the Gregorian calendar? ANS3 Julian calendar QSN4 What holiday was the inducement to revise the Julian calendar? ANS4 Easter QSN5 When did the First Council of Nicaea rule that Easter be celebrated by all Christians? ANS5 on the same day