Who is Mawu-Lisa the Creators from In the Beginning: Creation Stories from Around the World and what is their importance?

Mawu and Lisa were the twins born to the In Great Mother, Nana Buluku, in the legend, Moon and Sun. Mawu was the moon, possessing power over the night. and Lisa. her sister, was the sun, residing in the east. During an eclipse, they came together and had children.