Sundiata Kieta- 1217-1255 (In power 1235-1255) was the Prince of the Mali empire, which he founded in 1230, and lasted until 1600.
The main thing that Sundiata did that helped to improve mali was to create the Mali Empire.
He also defeated King Soumaoro of Sosso, in the Battle of Kirina, which is something that enabled him to get more land for his Empire