The more usual spelling is Akhenaten (I would hesitate to say correct, as its a translation of an ancient Egyptian name). The Aten (jtn) being the disc of the sun. He may or may not have written the Great Hymn to the Aten, which presaged at least one of the Psalms. In common with many of the nobility of the day, he slept with his sister, which union produced Tutankhamun (originally Tutankhaten).