Nigerian billionaires Aliko Dangote, Mike Adenuga, Abdulsamad Rabiu, and Femi Otedola have recorded changes in their net worth in the last one month.

LAGOS, Nigeria—Africa’s richest person, industrial titan Aliko Dangote, has a lofty goal: He wants to become Nigeria’s John D. Rockefeller, using his wealth to transform his homeland.

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 ...