Mesopotamian sky god. He belonged to a triad that included Bel and Ea. Though he was the highest god, his role in mythology, hymns, and cult was small. The father of all gods, evil spirits, and demons, and the god of kings and the calendar, he was depicted with headdress and horns signifying strength. His Sumerian counterpart, An, was originally envisaged as a great bull; he probably began as a god of herders.
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In Sumerian mythology and later for Assyrians and Babylonians, Anu (also An; (from Sumerian *An = sky, heaven)) was a sky-god, the god of heaven, lord of constellations, king of gods, spirits and demons, and dwelt in the highest heavenly regions. It was believed that he had the power to judge those who had committed crimes, and that he had created the stars as soldiers to destroy the wicked. His attribute was the royal tiara, most times decorated with two pairs of bull horns. In art he was sometimes depicted as a jackal .
He had several consorts, the foremost being Ki (earth), Nammu, and Uras. By Ki he was the father of, among others, the Annuna gods. By Nammu he was the father of, among others, Enki and Ningikuga. By Uras he was the father of Nin'insinna. According to legends, heaven and earth were once inseparable until An and Ki bore Enlil, god of the air, who cleaved heaven and earth in two. An and Ki were, in some texts, identified as brother and sister being the children of Anshar and Kishar. Ki later developed into the Akkadian goddess Antu. He was one of the oldest gods in the Sumerian pantheon, and part of a triad including Enlil, god of the sky and Enki, god of water. He was called Anu by the Akkadians, rulers of Mesopotamia after the conquest of Sumer in 2334 BC by King Sargon of Akkad. By virtue of being the first figure in a triad consisting of Anu, Enlil and Ea, Anu came to be regarded as the father and at first, king of the gods. Anu is so prominently associated with the E-anna temple in the city of Uruk (biblical Erech) in southern Babylonia that there are good reasons for believing this place to have been the original seat of the Anu cult. If this be correct, then the goddess Inanna (or Ishtar) of Uruk may at one time have been his consort.
The summing-up of divine powers manifested in the universe in a threefold division represents an outcome of speculation in the schools attached to the temples of Babylonia, but the selection of Anu, Enlil (and later Marduk) and Ea for the three representatives of the three spheres recognized, is due to the importance which, for one reason or the other, the centres in which Anu, Enlil and Ea were worshipped had acquired in the popular mind. Each of the three must have been regarded in his centre as the most important member in a larger or smaller group, so that their union in a triad marks also the combination of the three distinctive pantheons into a harmonious whole.
In the astral theology of Babylonia and Assyria, Anu, Enlil and Ea became the three zones of the ecliptic, the northern, middle and southern zone respectively. The purely theoretical character of Anu is thus still further emphasized, and in the annals and votive inscriptions as well as in the incantations and hymns, he is rarely introduced as an active force to whom a personal appeal can be made. His name becomes little more than a synonym for the heavens in general and even his title as king or father of the gods has little of the personal element in it. A consort Antum (or as some scholars prefer to read, Anatum) is assigned to him, on the theory that every deity must have a female associate, but Antum is a purely artificial product--a lifeless symbol playing even less of a part in what may be called the active pantheon than Anu.