Akhenaten was known before the fifth year of his reign as Amenhotep IV, a Pharaoh of the Eighteenth dynasty of Egypt, ruled for 17 years and died in 1336 BC or 1334 BC. He is especially noted for abandoning traditional Egyptian polytheism and introducing worship centered on the Aten, which is sometimes described as monotheistic or henotheistic. An early inscription likens him to the sun as compared to stars, and later official language avoids calling the Aten a god, giving the solar deity a status above mere gods.

The Great Hymn to the Aten is an ancient Egyptian hymn to the sun god Aten. It is attributed to Pharaoh Akhenaten, who attempted to convert Egypt to monotheism, with Aten being the only god. It was found, in its most complete form, in the tomb of Ay in the rock tombs at Amarna (ancient Akhet-Aten, the city Akhenaten founded). The hymn gives us a glimpse of the artistic outpouring of the Amarna period.

-from Wikipedia http://en.wikipedia.org/wiki/Akhenaten