The Sumerian Pantheon were the collective gods of Mesopotamia, particularly in Sumeria and Babylon. Not much about their history is known since so few records of their existence exist, but some details survive in ancient hieroglyphics. Unlike the Olympians, the Sumerian gods once lived on Earth as rulers and kings to their worshipers. According to ancient myths, they were descended from Tiamat, the great sea-goddess, who sired the gods of Sumeria. Anu, the sky-god, slew his father, Anshar, for control of Earth, and became ruler of the gods, but he was overthrown and driven from Earth by his son, Enlil, who was later in turn overthrown by Hadad. During the Babylonian Empire, Marduk, the god of wisdom, replaced Hadad. Over time, the Sumerian gods left rule of Earth to their mortal descendan