 The alliance fell apart when the Kalb defected to the Fatimids, who decisively defeated the Tayy and Kilab near Lake Tiberias in 1029, prompting Hassan and his tribesmen to flee northward.The Tayy established an alliance with the Byzantines and upon the latter's invitation, the 20,000-strong Tayy of Syria relocated their encampments from the vicinity of Palmyra to the al-Ruj plain, near Byzantine-held Antioch, in 1031.The Tayy continued to fight alongside the Byzantines under Hassan and his son Allaf, protecting Edessa from Numayrid and Marwanid advances in 1036.