The question whether Orpheus himself existed or not need not be raised. There was, in general, no doubt of it in the ancient world. Indeed, it makes very little difference in the history of human thought whether the great and influential personalities ever actually lived in human bodies. Personalities like Zeus, Odysseus, and Zoroaster, and even Hamlet and Don Quixote, have been more important in the world than millions of men who have lived and died. Their reality is the reality of an idea, and the best that we can know about them is what men have thought about them. The reality of Orpheus is to be sought in what men thought and said about him.
Linforth, Ivan M. 1973 (c 1941). The Arts of Orpheus. New York: Arno Press. xiif