The mighty son of Heracles by Deianeira,1 or, according to others by Melite2 or Omphale. After Heracles' death, Hyllus brought his father's body to Mount Oeta and constructed a funeral pyre, which was lit by Poeas. Heracles had commanded that Hyllus should marry Iole when he came of age,3 and by her he had four children: Cleodaeus,4 Evaechme,5 Aristaechme, and Hyllis.

Hyllus is the eponymous ancestor of the Dorian tribe of the Hylli (or Hylleans). He and his descendants are called the Heraclidae.