Nereids (NEE-ree-ids). The fifty daughters of the sea-god Nereus, one of whom bestowed upon Theseus a crown. This was on the occasion when the hero, challenged by King Minos of Crete, dove beneath the waves to prove that he was truly a son of the sea-god Poseidon. Collectively, the Nereids saved Jason and the Argonauts from the Wandering Rocks. They guided the Argo safely between the crags before they could crash together and trap the ship in between.