Bill Gates, Warren Buffett, and Carlos Slim are the only living men who crack the list -- and that's only counting their net worth at bubble peaks in 1999 and 2007.

You'll notice much of the list come from England and America. Partly this happens because that's were estimates were available. But it's also true that extreme private wealth occurred only several times in history, such as: The great lords of England, the Gilded Age, and today's credit bubble.