9. Alan Rufus (Wealth: 194B)
Alan Rufus Alan Rufus, also known as Alan the Red, served his uncle William the Conqueror during the Norman conquest of England. During his service, Rufus was able to acquire a vast amount of land titles in England. Rufus also commissioned the construction of the Richmond Castle and was known to be a generous donor of several religious structures. He died in 1090 at age 53 with a wealth that amounted to 7% of England’s GDP during his time; which at present, amounts to $194B.