House of Poitiers (Poitou).
Prince of Antioch. He was the younger son of William (Guillaume) IX, Duke of Aquitaine (1071-1126), and his wife Philippa, Countess of Toulouse, born in the very year that his father the Duke began his infamous liaison with Dangereuse de Chatelherault.
Following the death of Prince Bohemund II of Antioch in 1130, the principality came under the regency first of King Baldwin II (1130–31), then King Fulk (1131–35), and finally Princess Alice (1135–36), Bohemond's widow. The reigning Princess was Bohemond II's daughter, Constance (born 1127). Against the wishes of Alice, a marriage was arranged for Constance with Raymond.
Children with Constance :
Bohemond III
Maria
Philippa
Baldwin
In 1149 he was killed in the Battle of Inab in Iraq (today Syria) during an expedition against Nur ad-Din Zangi. He was beheaded by Shirkuh, the uncle of Saladin, and his head was placed in a silver box and sent to the Caliph Al-Muqtafi of Baghdad as a gift.