This surge in wealth propelled Dangote from the 209th richest person in the world to 83rd place ... firm Conoil with 6 oil blocks in the Niger Delta and just under 6% of publicly traded Nigerian ...

But 14th century African emperor Musa Keita is widely considered richest person in history ... Burkina Faso, Mali, Niger, Nigeria, and Chad. The rest of the world caught wind of his great ...

Historians estimate that he was the wealthiest person ever to have lived ... empire's borders from the Atlantic in the east to what is now Niger in the west. A devout Muslim, Mansa Musa observed ...