Sabbatian Songs of Faith: Ritual, Community, and Interreligious Encounters in the Late Ottoman Empire unveils the hidden world of the Ma’aminim—followers of the 17th-century Jewish messianic figure, Sabbatai Tzvi. After Tzvi’s dramatic conversion to Islam in 1666, many of his followers returned to mainstream Judaism. However, a dedicated group followed in his footsteps, converted to Islam, and established a new path, blending Sabbatian, Jewish, and Islamic elements within a distinct Ottoman-Sephardi cultural framework. For centuries, the Ma’aminim maintained secrecy, forming distinct communities (known as the Dönme) and playing a multifaceted role in Jewish and Ottoman histories. This book sheds new light on their social life and esoteric traditions through a comprehensive, interdisciplinary analysis of previously mostly unexamined mystical manuscripts in Ladino, Hebrew, and Ottoman Turkish. It explores their sacred songs, radical theology, rituals, folklore, and musical practices as reflections of communal reality and developments. By placing the Ma’aminim within a broader historical and cross-cultural perspective, Sabbatian Songs of Faith offers fresh insights into religious transformation, intercommunal exchanges, and the interplay between faith, ritual, and popular culture in the late Ottoman world and beyond.