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Semystra (Ancient Greek: Σημύστρα) was a town of ancient Thrace.[1] Dionysius of Byzantium wrote that there was an altar of the nymph Semystra there, whence the name of the town. Semystra was a nymph, she nurtured the Keroessa, who was the daughter of Io and Zeus.[2][3] Dionysius added that Semystra nearly became a big city during the Greek colonization, since the leaders of the colonization tried to found the city, but during the sacrifices, a crow snatched one of the thighs from the middle of the flames and carried it to the Bosporion promontory. The rest of the Greeks saw this as a sign from Apollo and went to the spot were the crow left the thigh.[2][3]

Its site is located at the head of the Golden Horn in European Turkey.[1][4]


  1. ^ a b Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 53, and directory notes accompanying.
  2. ^ a b Dionysius of Byzantium, Anaplous of the Bosporos, §24
  3. ^ a b Anaplous Bosporou. Dionysii Byzantii De Bospori navigatione quae supersunt; una cum supplementis in geographos graecos minores aliisque ejusdem argumenti fragmentis e codicibus MSS. edidit Carolus Wescher, p.12
  4. ^ Lund University. Digital Atlas of the Roman Empire.

Coordinates: 41°03′55″N 28°56′43″E / 41.065398°N 28.94536°E / 41.065398; 28.94536