Career
Her brother was Amaury de Montfort. According to the chronicler John of Marmoutier: The lecherous Fulk then fell passionately in love with the sister of Amaury de Montfort, whom no good man ever praised save for her beauty. Philip married her on 15 May 1092, despite the fact that they both had spouses living.
He was so enamoured of Bertrade that he refused to leave her even when threatened with excommunication.
Pope Urban II did excommunicate him in 1095, and Philip was prevented from taking part in the First Crusade. Astonishingly, Bertrade persuaded Philip and Fulk to be friends.
Orderic also claims she sought to kill Louis first through the arts of sorcery, and then through poison. Whatever the truth of these allegations, Louis succeeded Philip in 1108.
The dynasties founded by Fulk"s sons ruled for centuries, one of them in England (Plantagenet), the other in Jerusalem.