Akhenaten known before the fifth year of his reign as Amenhotep IV (sometimes given its Greek form, Amenophis IV, and meaning Amun
Amun, reconstructed Egyptian Yamānu , was a god in Egyptian mythology who in the form of Amun-Ra became the focus of the most complex system of theology in Ancient Egypt...

 is Satisfied
), was a Pharaoh
Pharaoh is a title used in many modern discussions of the ancient Egyptian rulers of all periods. The title originates in the term "pr-aa" which means "great house" and describes the royal palace...

 of the Eighteenth dynasty of Egypt
Eighteenth dynasty of Egypt
The eighteenth dynasty of ancient Egypt is perhaps the best known of all the dynasties of ancient Egypt...

 who ruled for 17 years and died perhaps in 1336 BC or 1334 BC. He is especially noted for abandoning traditional Egyptian polytheism and introducing worship centered on the Aten
Aten is the disk of the sun in ancient Egyptian mythology, and originally an aspect of Ra. The deified Aten is the focus of the monolatristic, henotheistic, or monotheistic religion of Atenism established by Amenhotep IV, who later took the name Akhenaten in worship in recognition of Aten...

, which is sometimes described as monotheistic
Monotheism is the belief in the existence of one and only one god. Monotheism is characteristic of the Baha'i Faith, Christianity, Druzism, Hinduism, Islam, Judaism, Samaritanism, Sikhism and Zoroastrianism.While they profess the existence of only one deity, monotheistic religions may still...

 or henotheistic.