If modern history goes back to the 1900s though, Rockefeller still has Bezos beat by more than double: "By the time of his death in 1937, estimates place his net worth in the range of US$300 billion to US$400 billion in adjusted dollars for the late 2000s (decade)." https://en.wikipedia.org/wiki/List_of_wealthiest_historical_...
An earlier major technical university endowed by the richest person of the time is a pretty awesome place... (he says with no bias whatsoever. :-)