Musa I of Mali
Reign c.: 1312–37 (25 years)Religion: Islam
Mansa Musa, or Musa I of Mali is considered to be the richest man to ever walk the face of the Earth with his wealth at $400 billion (at the time of his death in 1331). Musa was the tenth emperor of the Mali Empire, one of the prosperous Sahelian kingdoms that developed along the Saharan slave trade routes in the later medieval period. Musa Keita I (c. 1280 – c. 1337) was the tenth Mansa, which translates as "sultan" (king) or "emperor", of the wealthy West African Mali Empire.