Akhenaten

Akhenaten known before the fifth year of his reign as Amenhotep IV , was a pharaoh of the Eighteenth dynasty of Egypt who ruled foryears and died perhaps in 1336 BC or 1334 BC. He is especially noted for abandoning traditional Egyptian polytheism and introducing worship centered on the Aten, which is sometimes described as monotheistic or henotheistic. An early inscription likens the Aten to the sun as compared to stars, and later official language avoids calling the Aten a god, giving the solar deity a status above mere gods.

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Source: Wikipedia