The papal conclave of March–April 1605 was convened on the death of Pope Clement VIII and ended with the election of Alessandro Ottaviano de' Medici as Pope Leo XI on 1 April 1605. It was the first of two papal conclaves in 1605, with Leo dying on 27 April 1605, twenty-six days after he was elected, and the conclave to elect his successor being held in May. The conclave saw conflict regarding whether Cesare Baronius should be elected pope, and Philip III of Spain, the Spanish king, excluded both Baronius and the eventually successful candidate, Medici. Philip's exclusion of Medici was announced by Cardinal Ávila after his election to the papacy, and the other cardinals did not view it as valid since Medici had already been elected pope.