God of Air

Originally, he was simply nothing more than a deification of the concept of air, and thus wind, one of the four fundamental concepts held to have composed the primordial universe, in the Ogdoad cosmogeny, whose cult was strongest in Hermopolis. His name reflects this function, since it means the hidden one, reflecting the invisibility of the air, and of the wind. Like all other members of the Ogdoad, his male aspect was usually depicted as a frog, or frog-headed. Symbolically, invisibility was represented by the color blue, since it was the color of the sky, seen through the air, and so this was the color usually given to Amun's image.

As with the other concepts in the Ogdoad, he was dualistically considered to have a female aspect, referred to as Amunet (also spelt Amentet, Amentit, Imentet, Imentit, Amaunet, and Ament), which was simply the feminine form of the word Amun. The other female aspects of the Ogdoad were all depicted as snakes, thus Amunet was depicted likewise.

Gradually, as god of air, he came to be associated with the breath of life, which created the ba, particularly in Thebes. By the First Intermediate Period this had led to him being thought of, in these areas, as the creator god, titled father of the gods, preceding the Ogdoad, although also part of it. As he became more significant, he was assigned a wife (Amunet being his own female aspect, more than a distinct wife), and since he was the creator, his wife was considered the divine mother from which the cosmos emerged, who in the areas where Amun was worshipped was, by this time, Mut.

Amun became depicted in human form, seated on a throne, wearing on his head a plain deep circlet from which rise two straight parallel plumes, possibly symbolic of the tail feathers of a bird, a reference to his earlier status as a wind god.

Having become more important than Menthu, the local war god of Thebes, Menthu's authority became said to exist because he was the son of Amun. However, as Mut was infertile, it was believed that she, and thus Amun, had adopted Menthu instead. In later years, due to the shape of a pool outside the sacred temple of Mut at Thebes, Menthu was replaced, as their adopted son, by Chons, the moon god.

King

With the eviction of the Hyksos rulers from Egypt, by the armies of the Eighteenth dynasty, Thebes, where the victors were based, became the most important city, and so Amun became nationally important. To Amun the Pharaohs attributed all their successful enterprises, and on his temples they lavished their wealth and captured spoil. And so, when the Greeks reported back on their visits to Egypt, Amun, as king of the gods, became identified by the Greeks with Zeus, and so his consort Mut with Hera.

As the Egyptians considered themselves oppressed during the period of Hyksos rule, the victory under the supreme god Amun, was seen as his championing of the underdog. Consequently, Amun was viewed as upholding the rights to justice of the poor, being titled Vizier of the poor, and aiding those who travelled in his name, as the Protector of the road. Since he upheld Ma'at, those who prayed to Amun were required first to demonstrate that they were worthy, by confessing their sins.

Fertility God

When, subsequently, Egypt conquered Kush, they identified the chief deity of the Kushites as Amun. This deity was depicted as Ram headed, specifically a woolly Ram with curved horns, and so Amun started becoming associated with the Ram. Indeed, due to the aged appearance of it, they came to believe that this had been the original form of Amun, and that Kush was where he had been born.

However, since rams, due to their rutting, were considered a symbol of virility, Amun became thought of as a fertility deity, and so started to absorb the identity of Min, becoming Amun-Min. This association with virility lead to Amun-Min gaining the epithet Kamutef, meaning Bull of his mother, in which form he was often found depicted on the walls of Karnak, ithyphallic, and with a scourge.