Lucian of Samosata De astrologia 10

[10] As for the Greeks, they learned not a whit of astrology either from the Aethiopians or from the Aegyptians. It was Orpheus, the son of Oeagrus and Calliope, that first declared these matters unto them, but not at all plainly, nor did he bring the science forth unto illucidation but unto ingannation and pious fraude, such being the humour of the man. ¹ _ For he made a harp and exposed his mystick rites in poesy and his theology in song; and the harp, that had seven chords, discoursed the harmony of the errant spheres. It was by investigating and ventilating these matters that he enchanted and enthralled all creatures; for he regarded not that harp of his nor yet concerned himselfe with other musick, but this was the mightie harp of Orpheus, ² and to honour these things, the Greeks set apart a station in the heavens and numerous stars are denominated Orpheus his harp.

If ever you see Orpheus pictured in mosaick stones or in pigment, he sitteth in the centre, in the simili- tude of one that sings, holding in his hands the harp, and about him stand numberless creatures, among which a bull, a man, a lion, and others after their kind. When you see these, bethink you, pray, what his song was, what his harp, and what the bull or the lion that giveth ear to him. And if you would know the originalls that I speak of, you may behold each of them in the heavens.