The Babylonian Collection was left to Yale by J.P. Morgan in 1913. His estate at the time was estimated to be worth about $68.3M ($1.59B in 2024 dollars).

When I read that on his wikipedia page I thought "is that all?" I know I'm probably missing a bunch of other considerations, but geez, the 500th spot on the 2024 Forbes World's Billionaires list was shared by multiple individuals worth approximately $5.8B.