Minor references in early Christian writers
AUGUSTINE. DE CIV. DEI: BOOK 8. CHAP. 5 "Alexander of Macedon wrote to his mother as communicated to him by Leo, an Egyptian high priest. In this letter not only Picus and Faunus, and AEneas and Romulus or even Hercules, and AEsculapius and Liber, born of Semele, and the twin sons of Tyndareus, or any other mortals who have been deified, but even the principal gods themselves, to whom Cicero, in his Tusculan questions, alludes without mentioning their names, Jupiter, Juno, Saturn, Vulcan, Vesta, and many others whom Varro attempts to identify with the parts or the elements of the world, are shown to have been men."
MINUCIUS FELIX: OCTAVIUS, CHAP. XXI. "Alexander the Great, the celebrated Macedonian, wrote in a remarkable document addressed to his mother, that under fear of his power there had been betrayed to him by the priest the secret of the gods having been men: to her he makes Vulcan the original of all, and then the race of Jupiter."
ATHENAGORAS OF ATHENS CHAP. XXVIII. "But it is perhaps necessary, in accordance with what has already been adduced, to say a little about their names. Herodotus, then, and Alexander the son of Philip, in his letter to his mother (and each of them is said to have conversed with the priests at Heliopolis, and Memphis, and Thebes), affirm that they learnt from them that the gods had been men."