Denis Vovchenko shows how Russian policymakers, intellectuals, and prelates worked together with the Ottoman government, Balkan and other diplomats, and rival churches, to contain and defuse ethnic conflict among Ottoman Christians through the promotion of supraethnic religious institutions and identities. The envisioned arrangements were often inspired by modern visions of a political and cultural union of Orthodox Slavs and Greeks. Whether realized or not, they demonstrated the strength and flexibility of supranational identities and institutions on the eve of the First World War. The book encourages contemporary analysts and policymakers to explore the potential of such traditional loyalties to defuse current ethnic tensions and serve as organic alternatives to generic models of power-sharing and federation.