In Egyptian Mythology, Amon (also spelled as Amen, Amun, Ammon, Amoun) is the name of one of the Gods. The name means "The Hidden One." Amon was the patron deity of the city of Thebes from earliest times and was viewed (along with his consort Amenet) as a primordial creation-deity. He is represented in five forms: (1) a man, enthroned; (2) a frog-headed man (as a primordial deity); (3) a cobra-headed man; (4) an ape; (5) a lion. His sacred animals were the goose and the ram, though he was not depicted as them.
Up to Dynasty XII, Amon was unimportant except in Thebes; but when the Thebans had established their sovereignty in Egypt, Amen became a prominent deity, and by Dynasty XVIII was termed the King of the Gods.
His famous temple, Karnak, is the largest religious structure ever built by man. According to E.A.Wallis Budge's Gods of the Egyptians, Amon by Dynasty XIX-XX was thought of as "an invisible creative power which was the source of all life in heaven, and on the earth, and in the great deep, and in the Underworld, and which made itself manifest under the form of Ra."
Amon was self-created, according to later traditions; according to the older Theban traditions, Amon was created by Thoth as one of the eight primordial deities of creation (Amon, Amenet, Heq, Heqet, Nun, Naunet, Kau, Kauket).
During the New Kingdom, Amon's consort was Mut, "Mother," who seems to have been the Egyptian equivalent of the "Great Mother" archetype.
The two thus formed a pair reminiscent of the God and Goddess of other traditions such as Wicca.

Amon-RA or Amen-Ra:

A composite deity, invented by the priests of Amon as an attempt to link New Kingdom (Dyn. XVIII-XXI) worship of Amon with the older solar cult of the god Ra.

SEE ALSO Mut, Thoth, Ra.

(Source: Shawn C. Knight, "Egyptian Mythology FAQ")