Hayrettin Yücesoy is an associate professor of Middle Eastern and Islamic studies at Washington University in St. Louis. His books include Messianic Beliefs and Imperial Politics in Medieval Islam: The Abbasid Caliphate in the Early Ninth Century (2009).
Gibbon's flourish about 'Mahomet, sword in one hand, Koran in the other' long served as metonym for the diachronic Caliphate. Yucesoy provocatively but convincingly disputes whether 'Islamic political thought' was inflexibly Islamic. longside the religious scholars he highlights Umayyad and Abbasid bureaucrat-literati, who propounded ethical and managerial principles of governance. -- Garth Fowden, author of <i>Before and after Muhammad: The First Millennium refocused</i>