MUSÆUS, an ancient Greek poet, flourished at Athens in the mystic period of Grecian history. Some legends represent him as the son of Orpheus. At any rate, he is generally supposed to have been the disciple and imitator of that famous poet. He presided over the Eleusinian mysteries, and in that capacity he composed and sung his hymns. A hill near the citadel of Athens, to which he was wont to resort for meditation and study, and on which he was afterwards buried, is said to have been called Museion after him. His works are only known in a few detached passages quoted by Plato, Pausanias, Clemens Alexandrinus, Philostratus, and Aristotle. They are said to have consisted of oracles, precepts addressed to his son Eumolpus, a hymn to Ceres, a theogony, a poem on the War of the Giants, a treatise entitled Sphaera, and a work on Mysteries.