Hylas
The two joined the search for the Golden Fleece. Shortly after their ship left Greece, it put into an island. Hylas set off to look for fresh water. As he neared a spring, the nymphs living within it fell in love with him. They pulled him into the water. He was never seen again. When he did not come back to the ship, Heracles was overcome with grief. He searched the island a long time. The ship set sail without him. Some say Hylas drowned. Others say he fell in love with the nymphs and would not desert them.