Library (1.3.2)

Now Calliope bore to Oeagrus or, nominally, to Apollo, a son Linus,[*] whom Hercules slew; and another son, Orpheus,[*] who practised minstrelsy and by his songs moved stones and trees. And when his wife Eurydice died, bitten by a snake, he went down to Hades, being fain to bring her up,[*] and he persuaded Pluto to send her up. The god promised to do so, if on the way Orpheus would not turn round until he should be come to his own house. But he disobeyed and turning round beheld his wife; so she turned back. Orpheus also invented the mysteries of Dionysus,[*] and having been torn in pieces by the Maenads[*] he is buried in Pieria.