Akhenaten's religious revolution during the 18th Dynasty remains one of the most discussed episodes in ancient Egyptian history. For roughly seventeen years (c. 1353-1336 BC), Akhenaten systematically dismantled the traditional Egyptian pantheon in favor of exclusive worship of the Aten — the sun disk — in what appears to be the ancient world's closest approach to genuine monotheism before the Israelite tradition.

The scale of the transformation was extraordinary. The Amun priesthood, the most powerful religious institution in Egypt, was suppressed. Temples across Egypt were closed. A new capital, Akhetaten (modern Amarna), was built from scratch in the desert. The royal iconography changed fundamentally: Akhenaten and Nefertiti were depicted in naturalistic, even distorted styles completely unlike conventional Egyptian artistic representation.

Whether this constitutes genuine monotheism is contested. The Aten was an aspect of the traditional sun deity Re; Akhenaten himself was the sole intermediary between humans and the Aten, making the system also a kind of extreme royal cult.

The rapid restoration of the traditional religious order after Akhenaten's death — including deliberate erasure of his monuments — shows how deeply the revolution was resisted.