Akhenaten. Amenhotep IV (sometimes given its Greek form, Amenophis IV, and meaning Amun is Satisfied), a Pharaoh of the Eighteenth dynasty of Egypt, ruled for 17 years and died in 1336 BC or 1334 BC. He abandoned traditional Egyptian polytheism and introducing worship cantered on the Aten, which is sometimes described as monotheistic or henotheistic.