In Sumerian Mythology, Ninhursag is the daughter of Anu, and the half-sister of Enki and Enlil. She first had several daughters with Enki, then a son, Ninurta, with Enlil, and then later on two sons with Enki: Dumuzi and Nergal (or Irrigal).
She represents Mother Earth, the source of all life: from Ninhursag came the birth of the planets; she is usually seen wearing a leafy crown and holding a branch to indicate fertility. She is also known as Nin.Ti, meaning 'Lady-Life'.
In Earth's Galactic history, together with Enki, she would have been responsible for the creation of mankind, some 300.000 years ago. (dixit Sitchin).