Pope Leo XI’s papacy lasted only 27 days. He is remembered for his brief attempt at reforming the papacy and for his efforts to bring peace to Italy, but he died suddenly before his plans could be realized. Birth name: Alessandro di Ottaviano de' Medici Nationality: Papal States Born: June 12, 1535 Died: April 27, 1605 Pontificate: April 1, 1605 – April 27, 1605