With the end of the Fatimid era in Syria and Palestine, descendants of Mufarrij entered the service of the Muslim states of the region, first with the cadet branches of the Seljuk Empire, beginning with the Burids of Damascus, then their Zengid successors, who came to rule all of Syria and Upper Mesopotamia. At times, the Tayy fought alongside the Crusaders, who had conquered the Syrian coastal regions, including Palestine, in 1098–1100. By the end of the 11th century, the Banu Rabi'ah branch of the Tayy (direct descendants of Mufarrij) and the Mazyadid branch of the Banu Assad were the last influential Arab tribes in Syria and Iraq, with the rest having "disappeared from the political map", according to historian Mustafa A. Hiyari.