In Greek mythology, Achaeus or Achaios (/əˈkiːəs/; Ancient Greek: Ἀχαιός Akhaiós means 'griever',[1] derived from αχος achos, 'grief, pain, woe') was the eponym of Achaea.
[2] Achaeus was the son of Poseidon, the god of the sea and Larissa, daughter of Pelasgus, the son of Triopas, meaning he is of Argive descent through his mother's parentage.
Together with his brothers Phthius and Pelasgus, they left Achaean Argos with a Pelasgian contingent for Thessaly.
The only source of the accounts of Achaeus is recounted by Dionysius of Halicarnassus in his Roman Antiquities about the Pelasgian race's migration in connection with Achaeus.
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