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Events on Wednesday 10 April 1585 1
1502 – 1585Pope Gregory XIII (1502-1585)Died 10 April 1585, aged 83Ugo Boncompagni reigned as Pope Gregory XIII from 1572 until his death. He is best remembered for commissioning the Gregorian calendar reform of 1582, which corrected the drift of the Julian calendar and is still in use today.