Pope Leo XI (d. 1605)
Pope Leo XI (Italian: Leone XI; 2 June 1535 – 27 April 1605), born Alessandro Ottaviano de' Medici, was head of the Catholic Church and ruler of the Papal States from 1 April 1605 to his death. His pontificate is one of the briefest in history, having lasted under a month. He was from the prominent House of Medici originating from Florence. Medici's mother opposed his entering the priesthood and sought to prevent it by having him given secular honours, but after her death he eventually was ordained a priest in 1567. In his career he served as Florence's ambassador to the pope, Bishop of Pistoia, Archbishop of Florence, papal legate to France, and as the cardinal Prefect for the Congregation of the Bishops and Religious. He was elected to the papacy in the March 1605 papal conclave and served as pope for 27 days.