In Greek mythology, Achaeus (Ancient Greek: Ἀχαιός, Akhaiós) was a son of Xuthus and Creusa, the brother of Ion, and a grandson of Hellen. The Achaeans regarded him as the founder of their race, deriving from him both their own name and that of the region of Achaia. According to Pausanias, he was the father of Archander and Architeles, who travelled from Phthiotis to Argos and married daughters of Danaus.
Adapted from Wikipedia, "Achaeus (son of Xuthus)" · CC BY-SA 4.0
I.Family
In Greek mythology, Achaeus or Achaios (Ancient Greek: Ἀχαιός, Akhaiós) was a son of Xuthus and Creusa, and the brother of Ion as well as the grandson of Hellen.
According to Pausanias, he was the father of Archander and Architeles, who travelled from Phthiotis to Argos and each married daughters of Danaus.
II.Mythology
The Achaeans regarded him as the author of their race, and derived from him their own name as well as that of Achaia, which was formerly called Aegialus.
When his uncle Aeolus in Thessaly — whence he himself had come to the Peloponnesus — died, he went there and made himself master of Phthiotis, which now also received from him the name of Achaia.
III.Genealogy of the Hellenes
Achaeus belongs to the foundational genealogy of the Greek peoples. His line is traced through his father Xuthus and grandfather Hellen back to Deucalion, and further to the Titans Iapetus and Clymene. Through Achaeus and his brother Ion descend the eponymous ancestors of the Achaeans and the Ionians, while the related branches of Aeolus and Dorus account for the Aeolians and Dorians.