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Gregory XIIIOriginally Ugo Buoncompagni. 1502-1585.
Pope (1572-1585) who established many Catholic universities and seminaries and sponsored the adoption of the Gregorian calendar (1582).
(Biography) 1502–85, pope (1572–85). He promoted the Counter-Reformation and founded seminaries. His reformed (Gregorian) calendar was issued in 1582