The Sumerian Nanna, the moon. The chief astral deity, sometimes regarded as the son of Enlil and Ninlil; father of Utu-Shamash, the sun, and of Ishtar. He is lord of the calendar, fixing the seasons, and also a vegetation-deity and patron of fertility. With Shamash and Hadad he makes up the second triad of Mesopotamian gods. His chief temple was in Ur.