A Duke? Damn, pretty nice title to be granted to an invader, as opposed to him just taking it. I'm not really up on Norman history as to when it actually *became* Normandy. That makes sense that it takes its name from "north men." All of English and northern European history from that time on is pretty fascinating. Is Robert of Normandy (father of William the Conqueror) a descendant of Rollo's? If so, our Rollo is pretty much an ancestor of all the Norman kings....Henry I through Henry VIII. Edward I through Edward VI. Rollo must have really gotten around. 
