Amastris (now Amasserah or Samastro), a titular see of Paphlagonia in Asia Minor, on a peninsula jutting into the Black Sea. Its episcopal list dates from the third century (Gams, I, 454). It is mentioned by Homer (Iliad, II, 853), was a flourishing town in the time of Trajan (98–117), and was of some importance until the seventh century of our era.
Lequien, Oriens Christ. (1740), I, 561–566; Smith, Dict. of Greek and Roman Geogr., I, 118.