defeated by the conditions rather than by the Turks: the weather was very bad, large numbers of the army's horses died, and provisions became scarce. Campaigning in Cilicia and Syria (1137–1138) In the Levant, the emperor sought to reinforce Byzantine claims to suzerainty over the Crusader States and to assert his rights over Antioch. In 1137 he conquered Tarsus, Adana, and Mopsuestia from the Principality of Armenian Cilicia, and in 1138 Prince Levon I of Armenia and most of his family were brought as captives to Constantinople. This opened the route to the Principality of Antioch, where Raymond of Poitiers, Prince of Antioch, and Joscelin II, Count of Edessa, recognized themselves as vassals of the emperor in 1137. Even Raymond II, the Count of Tripoli, hastened northwards to pay homage to John, repeating the homage that his predecessor had given John's father in 1109. There then followed a joint campaign as John led the armies of Byzantium, Antioch, and Edessa against Muslim Syria. Aleppo proved too strong to attack, but the fortresses of Balat, Biza'a, Athareb, Maarat al-Numan, and Kafartab were taken by assault. Although John fought hard for the Christian cause in the campaign in Syria, his allies Prince Raymond of Antioch and Count Joscelin II of Edessa remained in their camp playing dice and feasting instead of helping to press the siege of the city of Shaizar. The Crusader Princes were suspicious of each other and of John, and neither wanted the other to gain from participating in the campaign. Raymond also wanted to hold on to Antioch, which he had agreed to hand over to John if the campaign was successful in capturing Aleppo, Shaizar, Homs, and Hama. Latin and Muslim sources describe John's energy and personal courage in prosecuting the siege. The city was taken, but the citadel defied assault. The Emir of Shaizar offered to pay a large indemnity, become John's vassal, and pay yearly tribute. John had lost all confidence in his allies, and a Muslim army under Zengi was approaching to try to relieve the city, therefore the emperor reluctantly accepted the offer. The emperor was distracted by a Seljuq raid on Cilicia and developments in the west, where he was pursuing a German alliance directed against the threat posed by the Normans of Sicily. Joscelin and Raymond conspired to delay the promised handover of Antioch's citadel to the emperor, stirring up popular