Plutarch, Alexander
Bernadotte Perrin, Ed.

3. However, after his vision, as we are told, Philip sent Chaeron of Megalopolis to Delphi, by whom an oracle was brought him from Apollo, who bade him sacrifice to Ammon and hold that god in greatest reverence, but told him he was to lose that one of his eyes which he had applied to the chink in the door when he espied the god, in the form of a serpent, sharing the couch of his wife. [2] Moreover, Olympias, as Eratosthenes says, when she sent Alexander forth upon his great expedition, told him, and him alone, the secret of his begetting, and bade him have purposes worthy of his birth. Others, on the contrary, say that she repudiated the idea, and said: ‘Alexander must cease slandering me to Hera.’ ¹

[3] Be that as it may, Alexander was born early in the month Hecatombaeon, ² the Macedonian name for which is Loüs, on the sixth day of the month, and on this day the temple of Ephesian Artemis was burnt. It was apropos of this that Hegesias the Magnesian made an utterance frigid enough to have extinguished that great conflagration. He said, namely, it was no wonder that the temple of Artemis was burned down, since the goddess was busy bringing Alexander into the world. [4] But all the Magi who were then at Ephesus, looking upon the temple's disaster as a sign of further disaster, ran about beating their faces and crying aloud that woe and great calamity for Asia had that day been born. To Philip, however, who had just taken Potidaea, there came three messages at the same time: [5] the first that Parmenio had conquered the Illyrians in a great battle, the second that his race-horse had won a victory at the Olympic games, while a third announced the birth of Alexander. These things delighted him, of course, and the seers raised his spirits still higher by declaring that the son whose birth coincided with three victories would be always victorious.