In Pictures: Billionaire Rivals

Read the full story Steven Bertoni

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©PIUS UTOMI EKPEI/AFP/Getty Images Aliko Dangote vs. Femi Otedola Nigeria's richest were close friends until spring 2008 when Dangote, who made a fortune off sugar and cement, outbid oil tycoon Otedola for Chevron's West Africa Division. Otedola claimed Dangote broke a gentlemen's agreement not to get involved in each other's industries. This March, Otedola accused Dangote and broker Nova Finance and Securities of manipulating Otedola's African Petroleum for "settlement of personal scores," after its shares fell 80% in eight weeks. Nigerian regulators cleared Dangote of stock manipulation, but suspended operations of Nova Finance for a year. The stock drop was enough to push Otedola out of the billionaires club for now.