In Greek mythology, Heleus (also Heleius or Helios) is a Mycenaean prince, one of the sons of Perseus and Andromeda. He joins his nephew Amphitryon's expedition against the Taphians and, after victory, shares rule of their domain with Cephalus. Laconian tradition made him eponym of Helos.
Adapted from Wikipedia, "Heleus" · CC BY-SA 4.0
I.Perseid brother
Apollodorus lists Heleus among Perseus and Andromeda's children beside Perses, Alcaeus, Sthenelus, Electryon, Mestor, and Gorgophone — the generation that anchors the Mycenaean stem before Amphitryon and Heracles.
When Amphitryon warred on the Taphians to avenge Electryon's cattle raid, Heleus went with him; after the victory he and Cephalus shared sovereignty over the conquered islands.
II.Helos
Pausanias and Strabo connect the Laconian town Helos with Heleus as founder and name-giver. The atlas id heleus-perseid keeps this Perseid distinct from the sun-god Helios and from other marsh-eponyms.