Ovid, Fasti 5. 164 ff
When darkening twilight ushers in the night, the whole flock of Hyades is revealed. Taurus’ face gleams with seven rays of fire, which Greek sailors call Hyades from their rain-word. To some they were the nurses of Bacchus, to others granddaughters of Tethys and old Oceanus. Atlas did not shoulder the load of Olympus yet, when lovely, eye-catching Hyas was born. Oceanus’ daughter, Aethra, bore him and the Nymphae in timely births, but Hyas was born first. While his beard was fresh, stags trembled in terror before him, and the hare was welcome prey. But when years matured his manhood, he bravely closed with the shaggy lioness and the boar. He sought the lair and brood of the whelped lioness and was bloody prey to the Libyan beast. His mother sobbed for Hyas, his sad sisters sobbed and Atlas too, whose neck would haul the world. The sisters surpassed both parents in pious love and won heaven. Their name is from Hyas.