William V, Marquess of Montferrat

William V of Montferrat (occ./piem. Guilhem, it. Guglielmo) (c. 1115 – 1191) also known regnally as William III of Montferrat while also referred to as William the Old or William the Elder, in order to distinguish him from his eldest son, William Longsword, was marquess of Montferrat from c. 1136 to his death in 1191. William was the only son of marquess Renier I and his wife Gisela, a daughter of William I, Count of Burgundy and widow of Count Humbert II of Savoy. It seems likely, given that he was still fit enough to participate in battle in 1187, that William was one of his parents' youngest children.

He was described by Acerbo Morena as of medium height and compact build, with a round, somewhat ruddy face and hair so fair as to be almost white. He was eloquent, intelligent and good-humoured, generous but not extravagant. Dynastically, he was extremely well-connected: a nephew of Pope Callixtus II, a half-brother of Amadeus III of Savoy, a brother-in-law of Louis VI of France (through his half-sister Adelasia of Moriana), and cousin of Alfonso VII of Castile.

William married Judith or Ita von Babenberg, daughter of Leopold III of Austria and Agnes of Germany, sometime before March 28, 1133. Judith was probably about 15 at the time. None of their surviving children seem to have been born before 1140 (there may have been older ones who died in infancy), and the youngest son was born in 1162. She died after 1168. They had five sons, four of whom became prominent in the affairs of the Kingdom of Jerusalem and of Byzantium:

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