There are many legendary accounts surrounding the life of Alexander the Great, with a relatively large number deriving from his own lifetime, probably encouraged by Alexander himself.
King Philip had a dream in which he took a wax seal and sealed up the womb of his wife. The seal bore the image of a lion. The seer Aristander interpreted this to mean that Olympias was pregnant, since men do not seal up what is empty, and that she would bring forth a son who would be bold and lion-like. (Ephorus FGrH 70 217)
After Philip took Potidaea in 356 BC, he received word that his horse had just won at the Olympic games, and that Parmenion had defeated the Illyrians. Then he got word of the birth of Alexander. The seers told him that a son whose birth coincided with three victories would always be victorious. When the young Alexander tamed the steed Bucephalus, his father noted that Macedonia would not be large enough for him.
In 336, Philip sent Parmenion with an army of 10,000 men, as vanguard of a force to free the Greeks living on the western coast of Anatolia from Persian rule. The people of Eresus on the island Lesbos erected an altar to Zeus Philippios. Alexander himself was the model for the image of Apollo on coins issued by his father.
When Alexander went to Egypt, he was given the title "pharaoh", which included the epithet "Son of Ra", declaring him to be the son of the sun. A story told that one night King Philip had found a huge snake in the bed next to his sleeping wife. Olympias was from Epirus and may have practiced a mystery cult that involved snake-handling. The snake was said to be Zeus Ammon in disguise. After his visit to the Siwa Oasis in February 331, Alexander often referred to Zeus-Ammon as his true father. Upon his returned to Memphis in April, he met envoys from Greece who reported that the Erythraean Sibyl had confirmed that Alexander was the son of Zeus.
By 330, Alexander had started to adopt elements of Persian royal dress. In 327 he introduced proskynesis a ritualized honor accorded by Persians to their rulers. This Greek soldiers resisted, as such prostrations were reserved for honoring the gods. They considered this blasphemy on Alexander's part and sure to bring condemnation from the gods.