Akhenaton , also called Amenhotep IV, pharaoh of Egypt from about 1350 to 1334 B.C.. He was the son of Amenhotep III and Tiy, and husband of Nefertiti. Akhenaton was the last important ruler of the 18th dynasty and notable as the first historical figure to establish a religion based on the concept of monotheism. He established the cult of Aton, the sun god or solar disk. After he established the new religion, sometimes referred to as solar monotheism, he changed his name from the royal designation Amenhotep IV to Akhenaton, meaning "Aton is satisfied." He moved his capital from Thebes to Akhetaton (now the site of Tell el-Amarna), a new city devoted to the celebration of Aton, and he ordered the obliteration of all traces of the polytheistic religion of his ancestors. He also fought bitterly against the powerful priests who attempted to maintain the worship of the state god Amon, or Amen. After Akhenaton's death. His son-in law, Tutankhamen, moved the capital back to Thebes.