One of more poorly understood aspects of the history of the Ottoman Empire has been the flourishing of Sufi mysticism under its auspices. This study tracks the evolution of the Halveti order from its modest origins in medieval Azerbaijan to the emergence of its influential Sa'baniyye branch, whose range extended throughout the Empire at the height of its expansion. By carefully reconstructing the lives of formerly obscure figures in the history of the order, a complex picture emerges of the connections of Halveti groups with the Ottoman state and society. Even more importantly, since the...