William V of Montferrat

William V “the Old” (c. 1115–1191) ruled Montferrat from 1135, the son of Marquis Renier I and Gisela of Burgundy. By Judith of Babenberg he had five sons, including Conrad, later King of Jerusalem, and Boniface, founder of the Kingdom of Thessalonica. A Second Crusade veteran, he backed Frederick Barbarossa against the Lombard League, then allied with Byzantine Emperor Manuel I Komnenos and married his son Renier to Manuel’s daughter Maria.

In 1183 he joined his grandson Baldwin V in the Holy Land. Saladin captured him at Hattin in 1187; freed in 1188, he died at Tyre in 1191.