Sybilla was the daughter of Fulk V of Anjou[1] and Ermengarde of Maine,[2] In 1123, she married William Clito, nephew and rival of King Henry I of England.
The archbishop of Reims intervened and a truce was signed, but Thierry took vengeance on Baldwin when he returned in 1149.
In 1157 Sibylla travelled with Thierry on his third pilgrimage, but after arriving in Jerusalem she separated from her husband and refused to return home with him.
Ioveta and Sibylla supported Queen Melisende of Jerusalem and held some influence over the church.
They supported the election of Amalric of Nesle as Latin Patriarch of Jerusalem over a number of other candidates.