Fulk le Jeune, born in 1092, was the younger son of Fulk IV le Réchin and his fifth wife Bertrade de Montfort. She was the daughter of Simon de Montfort, Count de Montfort l'Amaury. As an infant he was probably taken with his mother to be raised at the French court. He was at the French court in 1106 when the news arrived of his , Geoffrey IV, Count of Anjou's death. King Philip I then made his step-son, Fulk V, the Count of Anjou. The French king then made Duke William of Aquitaine Fulk's guardian as Fulk was not yet old enough to rule on his own. However the duke put Fulk in prison. Nothing the king or queen threatened could get Duke William to release the boy. After a year his father, Fulk le Réchin finally paid the duke a ransom of several towns on the border with Poitou. Fulk le Réchin died two years later on April 14, 1109. Fulk V "je June" succeeded his father as the count of Anjou.