SUMMARY
The religious institution of pilgrimage and Hajj practice had always counted as a significant socio – political as well as economic role throughout the Islamic history.Therefore;Muslim rullers had been trying to have an influence on Hajj ceremonies and other religious practices an example of which is Commanding religious preachers to mention their names in sermons,in order to gain popularity,credaibility,acceptability and ligitamacy.The first Abbasid Khalifs(caliphs) among the rullers who felt the need to participate in Hajj ceremony exploiting the propagation capacity and opportunity of pilgrimage institution in order to strengthen the foundations of their government legitimacy.On the other hand,the opposition groups of Abbasid Khalifs also had been attempting to exploit pilgrimage and Hajj ceremony in order to prove their superiority ouer Abbasid rullers to govern. Among the important opposing figures who opposed Abbasid rulling was Abumuslim Khorsani. Abomuslim himself was among the founders and loyals to Abbasid revolution.Howeres; as Abumuslim was abandoned very early from the revolution process by revolutionary forces, he made every attempt to revitalize his glory and power. Among the different ways which Abumuslim chose to expliot in order to restore his glory and regain his power was participating in Hajj ceremony and capturing the position of Head of pilgrims