1559 papal conclave

Papal conclave September–December 1559
Dates and location
5 September – 25 December 1559 Cappella Paolina, Apostolic Palace, Papal States
Key officials
Dean	Jean du Bellay
Sub-dean	François de Tournon
Camerlengo	Guido Ascanio Sforza di Santa Fiora
Protopriest	Robert de Lenoncourt
Protodeacon	Alessandro Farnese
Elected pope
Giovanni Angelo Medici Name taken: Pius IV
← May 1555 1565–66 →

The 1559 papal conclave (5 September – 25 December) was convened on the death of Pope Paul IV and elected Pope Pius IV as his successor. Due to interference from secular rulers and the cardinals' disregard for their supposed isolation from the outside world, it was the longest conclave of the 16th century.