John D. Rockefeller Was the Richest Person To Ever Live. Period, Smart News

Standard Oil, his company, is one of the biggest reasons we have anti-monopoly laws

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Blue-Blooded Facts About John D. Rockefeller, The First Billionaire - Factinate

TIL the richest American today have nothing on the Robber Barons of the 1800s. : r/todayilearned

Who is the richest person in all of history? - Quora

New Exhibition Highlights Mansa Musa, the Richest Man Who Ever Lived

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The 10 Richest People of All Time

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