Pope Pius IV (died 1565)

Pope Pius IV, born Giovanni Angelo Medici, was head of the Catholic Church and ruler of the Papal States from 25 December 1559 to his death, in December 1565. Born in Milan, his family considered itself a branch of the House of Medici and used the same coat of arms. Although modern historians have found no proof of this connection, the Medici of Florence recognised the claims of the Medici of Milan in the early 16th century.

March 31 is the 90th day of the year in the Gregorian calendar; 275 days remain until the end of the year.