Isabella was the only child of King Leo I by his second wife,
Sibylla of Cyprus. She was betrothed to
Andrew, but the betrothal did not occur. King Leo I died on May, 1219. At this juncture,
Raymond-Roupen, grandson of
Roupen III, attempted to claim the throne of Cilicia for himself, but he was defeated, captured, and executed. Isabella was proclaimed queen, under the
regency of
Adam of Baghras. After Adam was assassinated,
Constantine of Baberon was nominated as guardian. Regent Constantine arranged the marriage between Isabella and Philip in 1222. Philip, however, offended the
Armenians' sensibilities, and even despoiled the royal palace, sending the
royal crown to
Antioch. The Armenians had him imprisoned at Sis and later poisoned. ==Wife of Hethum of Barbaron==