In Greek mythology, Achaeus or Achaios (; Ancient Greek: Ἀχαιός Akhaiós means 'griever', derived from αχος achos, 'grief, pain, woe') was the name of two mythological characters: Achaeus, son of Poseidon and the eponym of Achaea. Achaeus, son of Xuthus and mythical founder of Achaean race. Achaeus, son of Phthia, daughter of Phoroneus and the god Zeus. Notes References

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