Who is Kaukji from The Haj and what is their importance?

Kaukji had been a Turkish Army officer in World War I and became a mercenary after the war. He is Bockmann's choice to be the supreme commander of the Arab uprising orchestrated by the Germans through the Mufti of Jerusalem. Haukji also led the failed attack on Tabah leading what was called Kaukji's Irregulars. He is one of the men at the meetings in Damascus to which Kabir summons Ibrahim. He is killed in an attack on Kastel.