When asked about rich people, you probably think of Bill Gates, Rockefeller, Warren Buffet, Carlos Slim, or the Rothschild family. But according to historians, the richest man to have ever lived was an Islamic Malian king named Mansa Musa. Mansa meaning King. Mansa Musa ruled over the Malian empire of Mali from 1312 till 1337 and caught the attention of Europeans and Arabs after his renown Hadj (Islamic pilgrimage) to Mecca in 1324. During this, Mansa Musa’s fortune was estimated at 400 billion dollars, and caught the eye of many far and beyond the countries he visited! He was not afraid to give zakat to the poor and build houses and mosques on his way to Mecca.