Walter IV of Brienne

Walter IV of Brienne (1205–1246), son of Walter III, was count of Brienne from birth. His father was killed after failing to claim the throne of Sicily, and Walter's inheritance in southern Italy was confiscated. He fought in the War of the Keys in 1228–1229 to recover it.

Sent young to Outremer, he married Maria, daughter of King Hugh I of Cyprus, in 1233 and received the County of Jaffa and Ascalon in 1235.

Captured on crusade in 1239, he later commanded the crusader army at La Forbie in 1244 and was imprisoned in Cairo. He was murdered in prison in 1246, leaving sons John and Hugh.