26 richest people of all time’:

1. Mansa Musa I, (Ruler of Malian Empire, 1280-1331) $400 billion
2. Rothschild Family (banking dynasty, 1740- ) $350 billion
3. John D Rockefeller (industrialist, 1839-1937) $340 billion
4. Andrew Carnegie (industrialist, 1835-1919) $310 billion
5. Tsar Nicholas II of Russia (last Emperor of Russia, 1868-1918) $300 billion
6. Osman Ali Khan, Asaf Jah VII (last ruler of Hyderabad, 1886-1967) $236 billion
7. William the Conqueror (King of England, 1028-1087) $229.5 billion
8. Muammar Gaddafi (former Libyan leader, 1942-2011) $200 billion
9. Henry Ford (Ford Motor Company founder, 1863-1947) $199 billion
10. Cornelius Vanderbilt (industrialist, 1794-1877) $185 billion
11. Alan Rufus (Fighting companion of William the Conqueror, 1040-1093) $178.65 billion
12. Bill Gates (Founder of Microsoft, 1955- ) $136 billion
13. William de Warenne, 1st Earl of Surrey (Norman nobleman, ??-1088) $146.13 billion
14. John Jacob Astor (businessman, 1864-1912) $121 billion
15. Richard Fitzalan, 10th Earl of Arundel (English nobleman, 1306-1376) £118.6 billion
16. John of Gaunt (son of Edward III, 1330-1399) £110 billion
17. Stephen Girard (shipping and banking mogul, 1750-1831) $105 billion
18. Alexander Turney Stewart (entrepreneur, 1803-1876) $90 billion
19. Henry, 1st Duke of Lancaster (English noble, 1310-1361) $85.1 billion
20. Friedrich Weyerhaeuser (timber mogul, 1834-1914) $80 billion
21. Jay Gould (railroad tycoon, 1836-1892) $71 billion
22. Carlos Slim (business magnate, 1940- ) $68 billion
23. Stephen Van Rensselaer (land owner, 1764- 1839) $68 billion
24. Marshall Field (Marshall Field & Company founder, 1834-1906) $66 billion
25. Sam Walton (Walmart founder, 1918-1992) $65billion
26. Warren Buffett (investor, 1930- ) $64billion