Psyllium (), or Psylla (Ψύλλα) was a fortified emporium on a river of the same name. It was located on the Pontus Euxinus in ancient Bithynia between Artanes and Kalpe.Arrian, Periplus Ponti Euxini, 14; Anon. Peripl. P. E., p. 5; Marcian, p. 70. The Tabula Peutingeriana calls it Philium.
Its site is located near Ağva in Asiatic Turkey. Another coastal town with a similar name, Psylla, was located on the coast further to the east, between Crenides and Tium.
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