Ammon is the name of a Libyan deity and his oracle in the desert. It became famous after Alexander the Great made a detour to consult the god. The modern name is Siwa.
More about: Ammon (Deity)Definition
Timeline
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570 BCE - 526 BCERule of Pharaoh Amasis of Egypt, who built a shrine to Ammon at Siwa.
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560 BCE - 546 BCERule of King Croesus of Lydia who offered sacrifices to Ammon at Siwa.
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Dec 332 BCEAlexander the Great visits the Oracle of Ammon at Siwa and is declared "master of the Universe" and son of Ammon.