Sangarus or Sangaros (Ancient Greek: Σάγγαρος) was a town of ancient Bithynia near the shore of the Propontis. In the 4th century, an early Christian sect, the Novatianists, held a synod here.[1] Yitzhak ha-Sangari may have been a native.
Sangaros must be somewhere on the coast from Çınarcık/Yalova to Hersek Asiatic Turkey.[2]