10. Cornelius Vanderbilt – 185 billion dollars
American industrialist and philanthropist who built his wealth in shipping and railroads.
9. Henry Ford – 199 billion dollars
American industrialist, the founder of the Ford Motor Company, and sponsor of the development of the assembly line technique of mass production.
8. Muammar Gaddafi – 200 billion dollars
Was a Libyan revolutionary, politician and political theorist.
7. William The Conqueror – 229,5 billion dollars
Was the first Norman King of England, reigning from 1066 until his death in 1087.
6. Mir Osman Ali Khan – 230 billion dollars
Was the last Nizam (or ruler) of the Princely State of Hyderabad and of Berar. He ruled Hyderabad between 1911 and 1948, until it was merged into India.
5. Nikolai Alexandrovich Romanov – 300 billion dollars
Was the last Emperor of Russia, Grand Duke of Finland, and titular King of Poland. His official short title was Nicholas II, Emperor and Autocrat of All the Russias.
4. Andrew Carnegie – 310 billion dollars
Was a Scottish-American industrialist who led the enormous expansion of the American steel industry in the late 19th century.
3. John D. Rockefeller – 340 billion dollars
Was an American industrialist and philanthropist. He was the founder of the Standard Oil Company, which dominated the oil industry and was the first great U.S. business trust.
2. Rothschild Family – 350 billion dollars
Is a family, originating in Frankfurt, Germany, that established a European banking dynasty starting in the late 18th century, that came even to surpass the most powerful families of the 1700s such as Baring and Berenberg.
1. Mansa Musa I – 400 billion dollars
Was the tenth Mansa, which translates as "King of Kings" or "Emperor", of the wealthy Malian Empire. At the time of Mansa Musa's rise to the throne, the Malian Empire consisted of territory formerly belonging to the Ghana Empire and Melle (Mali) and immediate surrounding areas.