Diodorus Siculus
Zeus-Ammon King in Egypt
And besides these there are other gods, they say, who were terrestrial, having once been mortals, but who, by reason of their sagacity and the good services which they rendered to all men, attained immortality, some of them having even been kings in Egypt. Their names, when translated, are in some cases the same as those of the celestial gods, while others have a distinct appellation, such as Helius, Cronus, and Rhea, and also the Zeus who is called Ammon by some, and besides these Hera and Hephaestus, also Hestia, and, finally, Hermes. — 1.13
Father of Osiris is Ammon
Osiris, they add, also built a temple to his parents, Zeus and Hera, which was famous both for its size and its costliness in general, and two golden chapels to Zeus, the larger one to him as god of heaven, the smaller one to him as former king and father of the Egyptians, in which role he is called by some Ammon. He also made golden chapels for the rest of the gods mentioned above, allotting honours to each of them and appointing priests to have charge over these. -1.15
Alexander Visits the Oracle of Zeus-Ammon
When Alexander was conducted by the priests into the temple and had regarded the god for a while, the one who held the position of prophet, an elderly man, came to him and said, “Rejoice, son take this form of address as from the god also.” He replied, “I accept, father; for the future I shall be called thy son. But tell me if thou givest me the rule of the whole earth.” The priest now entered the sacred enclosure and as the bearers now lifted the god and were moved according to certain prescribed sounds of the voice, the prophet cried that of a certainty the god had granted him his request, and Alexander spoke again: “The last, O spirit, of my questions now answer; have I punished all those who were the murderers of my father or have some escaped me?” The prophet shouted: “Silence! There is no mortal who can plot against the one who begot him. All the murderers of Philip, however, have been punished. The proof of his divine birth will reside in the greatness of his deeds; as formerly he has been undefeated, so now he will be unconquerable for all time.” Alexander was delighted with these responses. He honoured the god with rich gifts and returned to Egypt. — 17.51.1-4
Osiris and Ammon Equated
Osiris has been given the name Sarapis by some, Dionysos by others, Pluto by others, Ammon by others, Zeus by some, and many have considered Pan to be the same God; and some say that Sarapis is the God whom the Greeks call Pluto. — 1.25