Achaeus

The name Achaeus appears in Greek genealogical traditions as an eponymous ancestor. Sources record three distinct mythological figures named Achaeus; the best-attested figure in the provided material is Achaeus, the son of Xuthus and Creusa, brother of Ion and grandson of Hellen. In Pausanias' account this Achaeus is further father to Archander and Architeles, representing further branches of descent. As an eponym, the name functions to link lineages and explain ethnic or familial origins within the larger network of Hellenic genealogies.

Surviving sources as presented do not provide any physical or iconic description of Achaeus. He is represented only within genealogical lists and eponymous traditions as a named human ancestor; no bodily features, garments, or symbols are recorded in the cited material.

No supernatural powers, behaviors, or miraculous deeds are ascribed to Achaeus in the provided sources. His 'activity' within the mythic corpus is genealogical and onomastic: serving as an ancestral name that locates descendants and regional identities (for example, through his relation to Hellen, Ion, and his putative sons Archander and Architeles).