Businessman and Amazon founder Jeff Bezos is the richest man in the world.
He is the wealthiest man in modern history with a net worth of $149.4 billion, but not the wealthiest man of all time.
According to BBC, Mansa Musa, the 14th-century emperor of Mali, is believed to be the richest man ever with a net worth of $400 billion.
The emperor, who made his fortune from gold and salt, ruled from 1312 to 1337.
Rudolph Butch Ware, associate professor of history at the University of California, said it is almost impossible to describe how wealthy and powerful the ruler truly was.
Mansa Musa, who was born in 1280 into a family of rulers, inherited the throne when his brother Mansa Abu-Bakr abdicated to go on an expedition.
The emperor was able to grow his kingdom under his rule, annexing 24 cities, including Timbuktu.
However, after his death in 1337 at the age of 57, the empire which was taken over by his sons could not be held together, leading to its fall.
In other news, the CEO and owner of Amazon, Jeff Bezos, may become the world's first trillionaire by 2026 and not any time soon as many media reports claim.
It should be noted that the only wealthy man close to Bezos' mouth watery $143 billion (N54,070,800,000,000) net worth is
Microsoft co-founder, Bill Gates, who is valued at about $102 billion (N39,394,440,000,000).
Born in New Mexico in 1964, the Amazon chief has always been passionate about computers and that influenced his decision to study computer science and electrical engineering at Princeton University.
Some years into school, he quit and started an online bookshop from his garage called Amazon in 1995.
The initial success of the business was inspiring as it sold across 45 countries within the first 30 days.