In Sumerian mythology, An was the god whose name was synonymous with the sun's zenith, or heaven. He was the oldest god in the Sumerian pantheon, and part of a triad including Enlil, god of the earth and Enki, god of the watery deep. An was called Anu by the Akkadians, rulers of Mesopotamia after the conquest of Sumer in 2334 BCE by King Sargon of Akkad.