Hylas, son to Theiodamas, king of the Dryopes. Hercules ate one of Theiodamas' oxen. Theiodamas attacked Hercules and was killed. But Hercules made the king's son his page and was very fond of him and took Hylas along when Hercules went on the famous voyage with the Argonauts. On the island of Cios, however, Hylas, going to fetch water from a spring was pulled in by the nymphs who were enamoured of him. Hercules spent so much time searching for Hylas that the Arognauts grew impatient and sailed away without him.