Slaves on Horses: The Evolution of the Islamic PolitySlave soldiers are a distinctively Muslim phenomenon. Though virtually unknown in the non Muslim world, they have been a constant and pervasive feature of the Muslim Middle East from the ninth century AD into modern times. Why did Muslim rulers choose to place military and political power in the hands of imported slaves? It is this question which Dr Crone seeks to answer. Concentrating on the period from the rise of the Umayyads to the dissolution of