...d Castalius. But Panyassis, son of Polyarchus, who composed an epic poem on Heracles, says that Castalia was a daughter of Achelous. For about Heracles he says:—Crossing with swift feet snowy Parnassus He reached the immortal water of Castalia, daughter of Achelous. I have heard another account, that the water was a gift to Castalia from the river Cephisus. So Alcaeus has it in his prelude to ...