https://www.bbc.com/news/world-africa-47379458
The 10 richest men of all time
Mansa Musa (1280-1337, king of the Mali empire) wealth indescribable
Augustus Caesar (63 BC-14 AD, Roman emperor) $4.6tn (£3.5tn)
Zhao Xu (1048-1085, emperor Shenzong of Song in China) wealth incalculable
Akbar I...