Pope Leo XI

Pope Leo XI (Italian: Leone XI; 2 June 1535 – 27 April 1605), born Alessandro di Ottaviano de' Medici, was head of the Catholic Church and ruler of the Papal States from 1 April 1605 to his death, on 27 April 1605. His pontificate is one of the briefest in history, lasting under a month. He was from the prominent House of Medici originating from Florence.

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 Bishops and Regulars. He was elected to the papacy in the March 1605 papal conclave when he was almost seventy. He almost immediately suffered from fever and died 27 days into his papacy.

Source: Wikipedia — https://en.wikipedia.org/wiki/Pope_Leo_XI