I see that my 29th great grandfather, William de Warren, has just been named by Celebrity Net Worth as one of the 25 richest people who have ever lived, on an inflation adjusted basis. He comes in at number 13.
Which is nice.
My 3oth great grandfather, William the Bastard (aka William I, or William the Conqueror) comes in at number 7. Which is rather less heart-warming; he was not a nice man.