Aegae or Aigai (Ancient Greek: Αἰγαὶ), also known as Aega or Aiga (Αἰγά), was a town and polis (city-state) of ancient Achaea, and one of the 12 Achaean cities. It was situated upon the river Crathis and upon the coast, between Aegeira and Bura. It is mentioned by Homer in the Iliad, and was celebrated in the earliest times for its worship of Poseidon. It was afterwards deserted by its inhabitants, who removed to the neighbouring town of Aegeira; and it had already ceased to be one of the 12 Achaean cities on the renewal of the Achaean League in 280 BCE, its place being occupied by Ceryneia. Its name does not occur in Polybius. Neither Strabo nor Pausanias mention on which bank of the Crathis it stood, but it probably stood on the left bank, since the right is low and often inundated.
- Mogens Herman Hansen & Thomas Heine Nielsen (2004). "Achaia". An inventory of archaic and classical poleis. New York: Oxford University Press. pp. 478–479. ISBN 0-19-814099-1.
- Pausanias. Description of Greece. 7.25.12.
- Homer. Iliad. 8.203.
- Herodotus. Histories. 1.145.
- Strabo. Geographica. pp. 386-387. Page numbers refer to those of Isaac Casaubon's edition.
- Lund University. Digital Atlas of the Roman Empire.
- Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 58, and directory notes accompanying.