structural:expansion
Amun was a major ancient Egyptian deity who appears as a member of the Hermopolitan Ogdoad. Amun was attested from the Old Kingdom together with his wife Amunet. His oracle in Siwa Oasis, located Western Egypt, near the Libyan Desert remained the only oracle of Amun throughout. With the 11th Dynasty (c. 21st century BC), Amun rose to the position of patron deity of Thebes by replacing Montu.

Initially possibly one of eight deities in the Hermapolite creation myth, his worship expanded. After the rebellion of Thebes against the Hyksos and with the rule of Ahmose I (16th century BC), Amun acquired national importance, expressed in his fusion with the Sun god, Ra, as Amun-Ra (alternatively spelled Amon-Ra or Amun-Re). On his own, he was also thought to be the king of the gods.

Amun-Ra retained chief importance in the Egyptian pantheon throughout the New Kingdom (with the exception of the " Atenist heresy " under Akhenaten). Amun-Ra in this period (16th to 11th centuries BC) held the position of transcendental, self-created creator deity "par excellence"; he was the champion of the poor or troubled and central to personal piety. With Osiris, Amun-Ra is the most widely recorded of the Egyptian gods. Ra's name simply means "sun." Like most gods in Egyptian mythologies, gods had multiple names; his additional names were Re, Amun-Re, Khepri, Ra-Horakhty, and Atum.

As the chief deity of the Egyptian Empire, Amun-Ra also came to be worshipped outside Egypt, according to the testimony of ancient Greek historiographers in Libya and Nubia. As Zeus Ammon and Jupiter Ammon, he came to be identified with Zeus in Greece and Jupiter in Rome.