Then, yam, I will eat you."
This figure's enemy boasts "I am the wild yam of the rocks  nothing will make me leave" to which this man responds "I have in my camp seven master smiths who will shatter the rocks. Then, yam, I will eat you." His captured friend finds in his enemy's chamber poisonous snakes in urns and owls presiding over 9 severed heads. After sacrificing 100 oxen, 100 rams, and 100 cocks, this man learned that his enemy's mortal weakness was the cock and fashioned an arrow with a white cock's spur that would later defeat him. This man's mother was a (*) hunchback woman with great magical power that ravaged the land of Do in her previous form as a buffalo. Appearing lazy and ugly when he was born this man transformed himself by asking a blacksmith to build an iron rod that he used to lift himself up, bending the rod into a bow, resulting in his griot composing "The Hymn of the Bow". For ten points, name this man who defeated Sumanguru of the Sosso people to create the Mali Empire.
This figure's enemy boasts "I am the wild yam of the rocks  nothing will make me leave" to which this man responds "I have in my camp seven master smiths who will shatter the rocks.
Sundiata Keita or Sogolon Diata or Mari Diata (accept Djata for Diata in any answer)