However, subsequent pharaohs toppled the movement in the aftermath of Akhenaten's death, thereby restoring Egyptian civilization's traditional polytheistic religion.
Large-scale efforts were then undertaken to remove from Egypt and Egyptian records any presence or mention of Akhenaten, Atenist temples, and assertions of a uniquely supreme god.
During the reign of Thutmose IV, it was identified as a distinct solar god, and his son Amenhotep III established and promoted a separate cult for the Aten.
The religious reformation appears to coincide with the proclamation of a Sed festival, a sort of royal jubilee intended to reinforce the Pharaoh's divine powers of kingship.
The fifth year is believed to mark the beginning of Amenhotep IV's construction of a new capital, Akhetaten (Horizon of the Aten), at the site known today as Amarna.
The move separated the Pharaoh and his court from the influence of the priesthood and from the traditional centres of worship, but his decree had deeper religious significance too.
Taken in conjunction with his name change, it is possible that the move to Amarna was also meant as a signal of Akhenaten's symbolic death and rebirth.
For about twenty years, he largely supplanted the age-old beliefs and practices of the Egyptian state religion, and deposed its religious hierarchy, headed by the powerful priesthood of Amun at Thebes.
For fifteen centuries, the Egyptians had worshiped an extended family of gods and goddesses, each of which had its own elaborate system of priests, temples, shrines and rituals.
[12][13] Initially, Akhenaten presented Aten to the Egyptian people as a variant of the familiar supreme deity Amun-Ra (itself the result of an earlier rise to prominence of the cult of Amun, resulting in Amun becoming merged with the sun god Ra), in an attempt to put his ideas in a familiar religious context.
Unusually for New Kingdom art, the Pharaoh and his wife are depicted as approximately equal in size, with Nefertiti's image used to decorate the lesser Aten temple at Amarna.
This pandemic appears to have claimed the lives of numerous royal family members and high-ranking officials, possibly contributing to the decline of Akhenaten's government.
According to the most likely scenario, the widespread deaths due to the plague caused Akhenaten to appoint two co-regents in quick succession: Smenkhkare and Neferneferuaten.
[18] Though Akhenaten's last years saw possibly the most aggressive repression of Amun and, less likely, other gods, his death quickly resulted in the resurgence of the old cults.
He ordered a purge of the Amarna Period rulers, removing Akhenaten, Smenkhkare, Neferneferuaten, Tutankhamun, and Ay from the official lists of Pharaohs, and destroying their monuments, including most remaining Aten temples.
[21] Though this marked the de facto end of Atenism, the revolutionary cult left some lasting impact on ancient Egyptian religion.
The modern Druze regard their religion as being descended from and influenced by older monotheistic and mystic movements, including Atenism.