Athinganoi

The Athinganoi (Ancient Greek: Ἀθίγγανοι, singular Athinganos, Ἀθίγγανος, Atsinganoi) were a Manichaean sect regarded as Judaizing heretics who lived in Phrygia and Lycaonia but were neither Hebrews nor gentiles. They kept the Sabbath but were not circumcised. They were shomer negiah.

Other sources indicate that the Athinganoi were associated with the Simonians and had no connection to the Manichaean or Paulician sects. They settled in Byzantium in 1054: the year of the East-West Schism. The Athinganoi married Byzantine women, adopted Greek Orthodox Christianity, and eventually assimilated into the Slavic and Greek populations. In some studies, the Athinganoi are described as remnants of the Indo-Greeks who left India in 400 AD during the Migration period.