Achaiion or Achaeïum or Achaeum (Ancient Greek: Ἀχαίιον) was a town in the Tenedian Peraia of the ancient Troad. The legend AX (ACH) which some bronze coins found in this region bear is thought to refer to Ach(aiion) by Louis Robert, but others attribute the coins to Achilleion.
- Strabo. Geographica. 13.1.46. Page numbers refer to those of Isaac Casaubon's edition.
- Louis Robert (1951). Études de numismatique grecque. p. 8 n. 4.
- asiaminorcoins.com - coins of Achilleion; B.V. Head, Historia Numorum2 540, SNG Cop. Troas 64; J.M. Cook (1973). The Troad. Oxford. p. 181 n. 3. objects that whereas Achilleion is twice attested as a polis and therefore capable of minting coins (Herodotus 5.94.2, Stephanus of Byzantium s.v. Σίγειον) Achaiion never had political autonomy and always belonged to the Tenedian Peraia.
- Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 56, and directory notes accompanying.
- Lund University. Digital Atlas of the Roman Empire.