Moshe Sharon, Black Banners from the East: The Establishment of the Abbāsid State—Incubation of a Revolt, Max Schloessinger Memorial Series (Jerusalem: Magnes Press/ Hebrew University, 1983). Pp. 265.Jacob Lassner, Islamic Revolution and Historical Memory: An Inquiry into the Art of Abbāsid Apologetics, American Oriental Series (New Haven: American Oriental Society, 1986). Pp. 171.