In the Epic of Gilgamesh, Ninsun is depicted as a human queen who lives in Uruk with her son as king. Since the father of Gilgamesh was former king Lugalbanda, it stands to reason that Ninsun procreated with Lugalbanda to give birth.
Ninsun is called "Rimat-Ninsun", the "August cow", the "Wild Cow of the Enclosure", and "The Great Queen". In the Tello relief (the ancient Lagash, 2150 BC) her name is written with the cuneiform glyphs as: DINGIR.NIN.GUL where the glyph for GUL is the same for SUN2. The meaning of SUN2 is attested as "cow".