Background
She was the daughter of Fulk V of Anjou and Ermengarde of Maine, and wife of William Clito and Thierry, Count of Flanders. In 1123 Sibylla married William Clito, son of the Norman Robert Curthose and future Count of Flanders.
She was the daughter of Fulk V of Anjou and Ermengarde of Maine, and wife of William Clito and Thierry, Count of Flanders. In 1123 Sibylla married William Clito, son of the Norman Robert Curthose and future Count of Flanders.
She was the regent of Flanders in 1147-1149. Sibylla brought the County of Maine to this marriage, which was annulled in 1124 on grounds of consanguinity. The annulment was made by Pope Honorius II upon request from Henry I of England, William"s uncle.
Fulk opposed it and did not consent until Honorius excommunicated him and placed an interdict over Anjou.
Baldwin IV, Count of Hainaut took the opportunity to attack Flanders, but Sibylla led a counter-attack and pillaged Hainaut. In response Baldwin ravaged Artois.
The archbishop of Reims intervened and a truce was signed, but Thierry took vengeance on Baldwin when he returned in 1149. She became a nun at the Convent of Saints
Ioveta and Sibylla supported Queen Melisende and held some influence over the church, and supported the election of Amalric of Nesle as Latin Patriarch of Jerusalem over a number of other candidates.
Sibylla died in Bethany in 1165.