Hyssus or Hyssos (Ancient Greek: Ὕσσος), also known as Hyssi portus, or Susarmia or Sousarmia (Σουσάρμια), or Susurmaena or Sousourmaina (Σουσούρμαινα), was a port-town of ancient Pontus on the Black Sea coast, at the mouth of the Hyssus River, 180 stadia east of Trapezus. The Tabula Peutingeriana calls it Hyssilime. It seems to have been a place of some importance; for it was fortified, and had the "cohors Apuleia civium Romanorum" for its garrison. Other names borne by the town include Psoron Limen (Ψωρῶν λιμήν), Sousourmena, and Ysiporto.
- Anon. Peripl. p. 13.
- Procopius, Bell. Goth., 4.2.
- Arrian. Periplus Ponti Euxini. p. 6.
- Ptolemy. The Geography. 5.4.6.
- Notit. Imp. Orient. 27.
- Lund University. Digital Atlas of the Roman Empire.
- Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 87, and directory notes accompanying.
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