Question: who is the richest man in the world of all time?
Answer: At an estimated value of $400 billion, Mansa Musa I of Mali is the richest person who ever lived. Born in 1280, Mansa Musa was ruler of the Malian empire, and acquired the most part of his wealth from the production and trade of salt and gold; more than half of the world's supply at the time in fact.