This is the English version of this article translated by Patrick Hogan. The original Italian version was written by Mario Regali and first published on 29/09/2008.
Here is the Italian version of this entry.
Only Stephanus of Byzantium1 (p. 349, 2 Meineke, s.v. Κάλλατις) mentions an Ister of Callatis, who was the author of a καλὸν βιβλίον περὶ τραγῳδίας of which we have no other testimony. There was probably originally in the Suda2 a life of our Ister, which was later blended with the life of Ister …