Mansa Musa I, the richest person in history, had a personal net worth of $400billion at the time of his death in 1331.
Born in 1280, he ruled West Africa's Malian Empire which covered modern day Ghana, Timbuktu and Mali.
His country's production of more than half the world's supply of salt and gold contributed to Musa's vast wealth, which he used to build large mosques that still stand today.
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