1. Mansa Musa: $ 400 billion (378 billion euros)
Mansa Musa (or Kankou Moussa) was king of the Mali Empire in the fourteenth century. He carried the Mali Empire at its peak, the Fouta in Agadez and on the lands of the ancient empire of Ghana. It established diplomatic relations with Portugal, Morocco, Tunisia and Egypt. His reign is the golden age of the Malian empire.
His fortune, he built by exploiting gold and copper mines across the Sahara. He also fortunes in the salt trade. In 1324, he went on pilgrimage to Mecca, a journey that made him famous in North Africa and the Middle East. Indeed, he left with 60,000 men and 12,000 slaves. Within the caravan are also found, according to some accounts, 80 camels carrying between 50 and 300 pounds of gold powder each (the Mali unaware of the currency). In each city he passes through, Moussa offers its riches. They say he also built a new mosque every Friday regardless of the location where it stops that day.