Manasses of Hierges was an important crusader lord, and constable of the Kingdom of Jerusalem. He was the son of Hodierna of Rethel and Héribrand II of Hierges; Hodierna was a sister of King Baldwin II of Jerusalem. He arrived in Jerusalem around 1140 and was appointed constable of Jerusalem, the highest office of the kingdom, by his cousin Queen Melisende, after the death of Melisende's husband King Fulk in 1143. As constable he was in command of the army, and was sent to relieve the siege of Edessa in 1144. He did not arrive in time and the city fell to Zengi.