Bill Gates may be the richest man alive. But he's not the richest man in history. In fact, he barely makes the top 10.
Alibaba founder Jack Ma has been knocked off his perch as China's richest man by "new energy king" Li Hejun, according to the Hurun's 2015 Global Rich List.
Facebook co-founder Mark Zuckerberg is no longer among the world’s 10 richest technology billionaires.
Here's a note of the richest US Presidents (adjusted for inflation where applicable).