“Heracles, for instance, was by birth an Egyptian, who by virtue of his manly vigour visited a large part of the inhabited world and set up his pillar in Libya; and their proofs of this assertion they endeavour to draw from the Greeks themselves. For inasmuch as it is generally accepted that Heracles fought on the side of the Olympian gods in their war against the Giants, they say that it in no way accords with the age of the earth for the Giants to have been born in the period when, as the Greeks say, Heracles lived, which was a generation before the Trojan War, but rather at the time, as their own account gives it, when mankind first appeared on the earth; for from the latter time to the present the Egyptians reckon more than ten thousand years, but from the Trojan War less than twelve hundred. Likewise, both the club and the lion’s skin are appropriate to their ancient Heracles, because in those days arms had not yet been invented, and men defended themselves against their enemies with clubs of wood and used the hides of animals for defensive armour. They also designate him as the son of Zeus, but about the identity of his mother they say that they know nothing. The son of Alcmene, who was born more than ten thousand years later and was called Alcaeus at birth, in later life became known instead as Heracles, not because he gained glory (kleos) by the aid of Hera, as Matris says, but because, having avowed the same principles as the ancient Heracles, he inherited that one’s fame and name as well.
“The account of the Egyptians agrees also with the tradition which has been handed down among the Greeks since very early times, to the effect that Heracles cleared the earth of wild beasts, a story which is in no way suitable for a man who lived in approximately the period of the Trojan War, when most parts of the inhabited world had already been reclaimed from their wild state by agriculture and cities and the multitude of men settled everywhere over the land. Accordingly this reclamation of the land suits better a man who lived in early times, when men were still held in subjection by the vast numbers of wild beasts, a state of affairs which was especially true in the ease of Egypt, the upper part of which is to this day desert and infested with wild beasts. Indeed it is reasonable to suppose that the first concern of Heracles was for this country as his birthplace, and that, after he had cleared the land of wild beasts, he presented it to the peasants, and for this benefaction was accorded divine honours. And they say that Perseus also was born in Egypt, and that the origin of Isis is transferred by the Greeks to Argos in the myth which tells of that Io who was changed into a heifer.” – Diodorus Siculus 1.24