This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Sabbatai Zevi began making messianic declarations in the late 1640s, in the Ottoman city of Smyrna, and the claim might have remained a local curiosity had Nathan of Gaza not taken it up in 1665 and begun promoting it with a prophet's own conviction. Word spread quickly through Jewish communities from the Ottoman lands to Poland, encouraged by the desperation many communities felt after the Khmelnytsky massacres two decades earlier.
The movement collapsed, at least on its surface, in 1666. Brought before the Ottoman sultan and given the choice between conversion to Islam and execution, Zevi converted. For most of his followers, the conversion was simply a disproof: a messiah who becomes a Muslim under threat of death is not the messiah.
Not every believer read it that way. Nathan of Gaza, and later Sabbatean theologians, reworked the conversion into the movement's own doctrine: the messiah's descent into apparent apostasy was itself a necessary stage of a hidden redemptive process, gathering the sparks of holiness that Lurianic kabbalah held were scattered even in forbidden places. That move let belief survive the event that should have ended it, sustained for generations by a minority, including the Donmeh, a community in Ottoman lands that outwardly practised Islam while preserving Sabbatean belief privately.
Rabbinic authorities did not treat the survival gently. Continuing believers were placed under religious ban soon after the conversion, and Sabbateanism was named heresy by normative Judaism from that point onward, a verdict Gershom Scholem's landmark scholarship, the standard modern academic account of the movement, has not overturned.