 Complete the following phrase:  who trace their origins to the eponymous grandson of Muhammad. After receiving an education in Islamic, Ottoman, and Catholic schools, he went on to serve in the Ottoman army in World War I. At wars end he stationed himself in Damascus as a supporter of the Arab Kingdom of Syria. Following the Franco-Syrian War and the collapse of Arab Hashemite rule in Damascus, his early position on pan-Arabism shifted to a form of local nationalism for Palestinian Arabs and he moved back to Jerusalem. From as early as 1920 he actively opposed Zionism, and was implicated as a leader of the 