Leo that in exchange for Antioch, renouncing its overlordship to Lesser Armenia and to release Bohemond, who in 1201 died. With the death of Bohemond III there followed a 15-year struggle for power of Antioch, between Tripoli and Lesser Armenia. According to the rules of primogeniture Leo's great nephew Raymond-Roupen was the rightful heir of Antioch, and Leo's position was supported by the pope. On the other hand, however, the city commune of Antioch supported Bohemond IV of Antioch, on the grounds that he was the closest blood relative to the last ruling prince, Bohemond III. In 1207 Bohemond IV installed a Greek patriarch in Antioch, despite the East–West Schism, under the help of Aleppo, Bohemond IV drove Leo out of Antioch. Fifth Crusade and afterwards In 1213 Pope Innocent III's papal bull Quia maior called for all of Christendom to lead a new (Fifth) crusade. This strengthened the support of sultan al-Adil I, an Ayyubid-Egyptian general who supported Raymond-Roupen's claims in Antioch. In 1216 Leo installed Raymond-Roupen as prince of Antioch, and ending all military aspect of the struggle between Tripoli and Lesser Armenia, but the citizens again revolted against Raymond-Roupen in and Bohemond of Tripoli was recognised as the fourth prince of that name. Bohemond IV and his son Bohemond V remained neutral in the struggles of the Guelphs and Ghibellines to the south which arose when Frederich II married Isabella II, and in 1233 Bohemond IV died. From 1233 onwards Antioch declined and appeared rarely in records for 30 years, and in 1254 the altercations of the past between Antioch and Armenia were laid to rest when Bohemond VI of Antioch married the then 17‑year‑old Sibylla of Armenia, and Bohemond VI became a vassal of the Armenian kingdom. Effectively, the Armenian kings ruled Antioch while the prince of Antioch resided in Tripoli. The Armenians drew up a treaty with the Mongols, who were now ravaging Muslim lands, and under protection they extended their territory into the lands of the Seljuq dynasty in the north and the Aleppo territory to the south. Antioch was part of this Armeno-Mongol alliance. Bohemond VI managed to retake Lattakieh and reestablished the land bridge between Antioch and Tripoli, while the Mongols insisted he install the Greek patriarch there rather than a Latin one, due to the Mongols attempting to strengthen ties with the Byzantine Empire. This earned Bohemond the enmity of the