Son of Theiodamas, king of the Dryiopians, whom Heracles
killed in a fit of drunkeness. When Heracles
recovered he fell in love with the beautiful Hylas and took him to his household. Hylas was Heracles
' lover and companion for many years, and participated in many of his great adventures, including the voyage over the Argo
When the Argonauts landed in Cios, Hylas was sent to fetch water from a near-by spring, but there a water nymph, seeing his great beauty, kidnapped and enspelled him and hidden him within the spring.
Heracles and Polyphemus (not the cyclops) looked for him desperately, and Heracles was so heartbroken that he missed the sail of the Argo.