\"Pope Gregory XIII (Latin: Gregorius XIII; 7 January 1502 – 10 April 1585), born Ugo Boncompagni, was head of the Catholic Church and ruler of the Papal States from 13 May 1572 to his death in 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally accepted civil calendar to this day.\"
\"Gregorio XIII (en latín: Gregorius XIII), de nombre secular Ugo Buoncompagni (Bolonia, 7 de enero de 1502-Roma, 10 de abril de 1585), fue el papa n.º 226 de la Iglesia católica de 1572 a 1585.\"
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Gregorio XIII como materia en Worldcat Identities
Gregorio XIII como materia en Worldcat
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