Hylas

Son of Theiodamas, king of the Dryopes, and of the Nymph Menodice. He was a favourite of Heracles, whom he accompanied on the Argonautic expedition. When Heracles disembarked upon the coast of Mysia to cut himself a fresh oar, Hylas followed him to draw water from a fountain, the Nymphs of which drew the beautiful youth down into the water. The Argonauts having gone on their way, Heracles, with his sister's son Polyphemus, remained behind to search for him. On failing to find him, he did not leave until he had taken hostages from the Mysians, and made them that they would produce the boy either dead or alive. After that the inhabitants of Cios (founded by Polyphemus and afterwards called Prusias) continually sought for Hylas, and sacrificed to him every year at the fountain, and thrice called him by name.