Anu is the Mesopotamian divine personification of the sky and he known as the Supreme god in Mesopotamia.
Both Enki and Enlil are his sons, and together with Anu, they form the highest divine order of Mesopotamia. Anu used to be the leader of the pantheon, but this is a title that he later bestows on either Enki or Enlil (sources differ on this matter).
Anu has multiple consorts: Urash, Ki and Nammu. All Mesopotamian gods can be traced back to his lineage.