(1502–85), pope 1572–85. The Gregorian calendar, still in use, was introduced in 1582 as a result of his efforts to correct the errors in the Julian calendar.
Definition of Gregory XIII in US English:
Gregory XIII
proper noun
(1502–85), pope 1572–85; born in Italy. The Gregorian calendar, still in use, was introduced in 1582 as a result of his efforts to correct the errors in the Julian calendar.