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Death of Pius IV

When: 9 December 1565
Where: Papal States
Part of: Succession of Pope Pius V and Initial Reforms

Pope Pius IV died in December 1565 due to complications from a urinary tract infection and high fever.

Pius IV, who had ruled since 1559, passed away on 9 December 1565. His death was caused by complications following an infection in the urinary tract and a high fever, creating the vacancy for the next papal election.

Sources

Pope Pius IV Wikipedia, revision of 2026-07-03

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.