William I the Conqueror, $209–229 billion
According to different estimations, William I the Conqueror had about $209–229 billion. William I the Conqueror was the first King of England after the Norman invasion in 1066. William’s reign had huge consequences for the country: he set up the united English Kingdom, he created the army and the fleet, he made the so-called Domesday Book, and he started to build the stone fortresses, the first one of which was a tower that was built in 1078.
https://www.msn.com/en-in/money/photos/the-20-richest-people-of-all-time/ss-BBsg
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Gaddafi was assassinated by USA because he wanted to create currency backed up with gold and start doing oil transactions with it. If he did succeed USA would start spiraling down into recession because they would have nowhere to launder freshly printed dollars.
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However, the richest families are not publicly known.
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