I would love to help but I don't think I have studied this
Benjamin Franklin is the correct answer.
If this is the same as "William the Conqueror" then I'd go for 1066. There's a sort of comic history book written once called "1066 and all that".
It grew mostly because of its trade with the ancient Romans and with India;at the height of its power, the empire was strong enough to create its own money.