Atenism (or the Amarna heresy) is the earliest known, if not well-documented, monotheistic religion, associated above all with the eighteenth dynasty Pharaoh Amenhotep IV, better known under the name he later adopted, Akhenaten. In the 14th century BC it was Egypt's state religion for around 20 years, before a return to the traditional gods so comprehensive that the heretic Pharaohs associated with Atenism were erased from Egyptian records.
The Aten, the god of Atenism, first appears in texts dating to the 12th dynasty, in the Story of Sinuhe. Here during the Middle Kingdom, the Aten "as the sun disk...was merely one aspect of the sun god Re. The Aten, hence, was a relatively obscure sun god; without the Atenist period, it would barely have figured in Egyptian history. Although there are indications that the Aten was becoming slightly more important in the eighteenth dynasty period - notably Amenhotep III's naming of his royal barge as Spirit of the Aten - it was Amenhotep IV who introduced the Atenist revolution, in a series of steps culminating in the official installment of the Aten as Egypt's sole god. Although each line of kings prior to the reign of Akhenaten:
Year 5 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. Evidence of this appears on three of the boundary stelae used to mark the boundaries of this new capital. At this time, Amenhotep IV officially changed his name to Akhenaten (Agreeable to Aten) as evidence of his new worship. The date given for the event has been estimated to fall around January 2 of that year. In Year 7 of his reign the capital was moved from Thebes to Akhetaten (near modern Amarna), though construction of the city seems to have continued for two more years. In shifting his court from the traditional ceremonial centres Akhenaten was signalling a dramatic transformation in the focus of religious and political power.
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. It may also have coincided with the death of his father and the end of the coregency. In addition to constructing a new capital in honor of Aten, Akhenaten also oversaw the construction of some of the most massive temple complexes in ancient Egypt, including one at Karnak and one at Thebes, close to the old temple of Amun.
In Year 9, Akhenaten strengthened the Atenist regime, declaring the Aten to be not merely the supreme god, but the only god, a universal deity, and forbidding worship of all others, including the veneration of idols, even privately in people's homes - an arena the Egyptian state had previously not touched in religious terms. Atenism was then based on strict unitarian monotheism, the belief in one single God. Aten was addressed in prayers, such as the Great Hymn to the Aten: "O Sole God beside whom there is none".
Akhenaten staged the ritual regicide of the old supreme god Amun, and ordered the defacing of Amun's temples throughout Egypt, and of all the old gods. The word for `gods' (plural) was proscribed, and inscriptions have been found in which even the hieroglyph of the word for "mother" has been excised and re-written in alphabetic signs, because it had the same sound in ancient Egyptian as the sound of name of the Theban goddess Mut. Aten's name is also written differently after Year 9, to emphasise the radicalism of the new regime. No longer is the Aten written using the symbol of a rayed solar disc, but instead it is spelled phonetically.
The context appears to have been an Egypt hit by catastrophe, seemingly abandoned by the old gods: a series of pandemics is known to have occurred throughout the Near East of this period, and some speculate that it could coincide with the eruption of the volcano of Thera, which would have covered much of Egypt in a layer of destructive ash, killing crops and livestock. Certainly, Amenhotep III's construction of over 700 statues to the god of destruction, Set, suggests Atenism as being more than merely the personal whim of Akhenaten, but at least in part a desperate measure on the part of a Pharaoh responsible for the well-being of his kingdom, above all by ensuring a good relationship with the gods.
In this context, Akhenaten carried out a radical program of religious reform which, for a period of about twenty years, 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 worshipped and sacrificed to an extended family of gods and goddesses, each of which had its own elaborate system of priests, temples, shrines and rituals. A key feature of these cults was the veneration of images and statues of the gods, which were worshipped in the dark confines of the temples.
The pinnacle of this religious hierarchy was the Pharaoh, who was both king and living god, and the administration of the Egyptian kingdom was thus inextricably bound up with, and largely controlled by, the power and influence of the priests and scribes. Akhenaten's reforms cut away both the philosophical and economic bases of priestly power, abolishing the cults of multiple deities, and with them the large and lucrative industry of sacrifices and tributes that the priests controlled.
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. Aten is the name given to the solar disc, whereas the full title of Akhenaten's god was Ra-Horus, who rejoices in the horizon in his name of the light which is in the sun disc. (This is the title of the god as it appears on the numerous stelae which were placed to mark the boundaries of Akhenaten's new capital at Akhetaten.)
However in Year 9 of his reign Akhenaten declared a more radical version of his new religion by declaring Aten not merely the supreme god, but the only god, and that he, Akhenaten, was the only intermediary between the Aten and his people. He even staged the ritual regicide of Amun, and ordered the defacing of Amun's temples throughout Egypt. In contrast to the old gods, Aten appears primarily to have been seen as a loving and protective god, whose primary goal was not to punish and demand allegiance and sacrifice but to support his people through his presence. Key features of Atenism included a ban on idols and other images of the Aten, with the exception of a rayed solar disc, in which the rays (commonly depicted ending in hands) appear to represent the unseen spirit of Aten. New temples were constructed, in which the Aten was worshipped in the open sunlight, rather than in dark temple enclosures, as the old gods had been.
Although idols were banned - even in people's homes - these were typically replaced by functionally equivalent representations of Akhenaten and his family venerating the Aten, and receiving the ankh (breath of life) from him. The radicalisation of Year 9 (including spelling Aten phonetically instead of using the rayed solar disc) may be due to a determination on the part of Akhenaten to enforce a probable misconception among the common people that Aten was really a type of sun god like Ra. Instead, the idea was reinforced that such representations were representations above all of concepts - of Aten's universal presence - not of physical beings or things.
Images of Akhenaten and Nefertiti usually depict the Aten prominently above that pair, with the hands of the Aten closest to each offering Ankhs. Unusually for new-kingdom art the Pharaoh and his Great Royal Wife are depicted as approximately equal in size, which together with Nefertiti's image used to decorate the lesser Aten temple at Armana may suggest she also had a prominent official role in Aten worship.
Artistic representations of Akhenaten usually give him a strikingly feminine appearance, with slender limbs, a protruding belly and wide hips. Other leading figures of the Amarna period, both royal and otherwise, are also shown with some of these features, suggesting a possible religious connotation, especially as some sources suggest that private representations of Akhenaten, as opposed to official art, show him as quite normal. However, according to some controversial theories, the strikingly unusual representations may have been due to non-religious factors - Akhenaten may actually been a woman masquerading as a man, which had been known to happen in Egyptian politics once or twice, or he may have been a hermaphrodite or had some other intersex condition. It is also suggested by Bob Brier, in his book "The Murder of Tutankhamen", that the family suffered from Marfan's syndrome, which is known to cause elongated features, and that this may explain Akhenaten's appearance.
Marfan's syndrome can also cause partial blindness, which has been used by some scholars to explain his veneration of the Sun as one of the few "godlike" things he may have been able to see: traditional Egyptian temples unlike open-air Aten temples got progressively darker and more claustrophobic as you neared the inner shrine. This may also explain images of Akhenaten picking up his daughters and raising then to eye height, representing not displays of affection but an artists depiction of his difficulty in identifying people.
With Akhenaten's death, the Aten cult he had founded almost immediately fell out of favor due to pressures from the Priesthood of Amun. Tutankhaten, who succeeded him at age 8 (with Akhenaten's old vizier, Ay, as regent) changed his name to Tutankhamun in year 3 of his reign (1348 BC or 1331 BC) and abandoned Akhetaten, the city falling into ruin. Tutankhaten became the puppet king of the priests, thus the reason for his change of name. The priests threatened the unstable rulership of the child king and forced him to take various drastic actions which corrupted the written record of Egyptian succession and history, deleting the Amarna Revolution and Atenism. Temples Akhenaten had built, including the temple at Thebes, were disassembled, reused as a source of building materials and decorations for their own temples, and inscriptions to Aten defaced. Finally, Akhenaten, Smenkhkare, Tutankhamun, and Ay were removed from the official lists of Pharaohs, which instead reported that Amenhotep III was immediately succeeded by Horemheb.
Because of the monotheistic character of Atenism, a link to Judaism (and subsequently the monotheistic religions springing from it) has been suggested by various writers. Psychologist Sigmund Freud considered Akhenaten to be the pioneer of monotheistic religion and Moses as Akhenaten's follower in his book Moses and Monotheism (see also Osarseph).