Which African empire's ruler Mansa Musa was history's richest man?

The Mali Empire was an empire in West Africa from c. 1235 to 1610. The empire was founded by Sundiata Keita and became renowned for the wealth of its monarchs, especially Mansa Musa. At its peak, Mali was the largest empire in West Africa, widely influencing the culture of the region through the spread of its language, laws, and customs.