The pronouncements of Sabbatai Tsevi (1626-76) gave rise to Sabbatianism, a key messianic movement in Judaism that spread across Jewish communities in Europe, Asia, and North Africa. The movement, which featured a set of theological doctrines in which Jewish Kabbalistic tradition merged with Muslim and later Christian elements, suffered a setback with Tsevi's conversion to Islam in 1666. Nonetheless, for another hundred and fifty years, Sabbatianism...