Gebhard Truchsess von Waldburg, Archbishop-Elector of Cologne (born 1547)

Gebhard Truchsess von Waldburg was the archbishop-elector of Cologne from 1577 to 1588. After pursuing an ecclesiastical career, he won a close election in the cathedral chapter of Cologne over Ernst of Bavaria. After his election, he fell in love with and later married Agnes von Mansfeld-Eisleben, a Protestant canoness at the Abbey of Gerresheim. His conversion to Calvinism and announcement of religious parity in the electorate triggered the Cologne War.

May 31 is the 151st day of the year in the Gregorian calendar; 214 days remain until the end of the year.