King Leo
The Principality of Antioch fell to the Egyptian Mamluks in 1268. Sibylla's husband, Bohemond VI, died in 1275, and their son, Bohemond VII, inherited the County of Tripoli. Since Bohemond VII was then a minor, Sibylla assumed government in his name as regent. She was challenged by King Hugh III of Cyprus, who claimed regency as the closest adult in the line of succession. But family custom and popular opinion was on the princess's side. 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. Hugh thus found no support.