To your point, the first Duke of Normandy was Rollo, a Viking warrior believed to be a nobleman from Denmark or Norway. He raided Northern France and up the Seine until the King gave him Normandy if he would quit raiding and swear fealty. His descendant, William the Conqueror, invaded England and seized the Crown. The rest, as they say, is history.
The present heir, Prince Charles, is named after a couple of the most worthless absolutist Kings of the past. Charles I was beheaded, and deservedly so, after repeatedly making war on Parliament. His successor, Charles II, a philandering playboy, sent agents all around Europe, kidnapping all the “regicides” who voted to execute his father, and had them drawn and quartered (eviscerated while alive). That’s precisely what our Founding Fathers meant by “cruel & unusual punishment.” That was only about a century before the American Revolution, so the Founders remembered it well.