The supreme deity in ancient Sumerian beliefs is Anu, regarded as the sky god and ruler of the pantheon. He personifies the concept of heaven and is considered a creator god whose authority governs the cosmos. Anu is often depicted as a powerful figure who holds the power to determine fate and grant kingship to mortals. His influence extends to various aspects of Sumerian life, including governance and religion. Worshipped throughout Mesopotamia, Anu's significance reflects the Sumerians' understanding of the universe and their place within it.