She was closely allied with the bishop of Tortosa, Bartholomew Mansel, which frustrated the scheme to install her as ruler of Tripoli instead of her daughter Lucia after Bohemond VII's death in 1287.
[1] In 1254, at the suggestion of the crusader King Louis IX of France, Sibylla was married to Bohemond VI, the prince of Antioch and count of Tripoli.
She was challenged by King Hugh III of Cyprus, who claimed regency as the closest adult in the line of succession.
She sent her son to the court of her brother King Leo III of Armenia and appointed the bishop of Tortosa, Bartholomew Mansel, as her bailli.
They failed to remove Paul of Segni, who was Bohemond VI's uncle and bishop of Tripoli, due to his friendship with the Knights Templar.
[6] His heir was his sister, Sibylla's daughter, Lucia, who lived in Apulia with her husband, Narjot of Toucy, former admiral of Charles I of Anjou.