1066 Battle of Hastings: William, Duke of Normandy and his Norman army defeat the English forces of Harold II, who is killed in the battle. Check out the TV Series King and Conqueror. It is based on this very integral period of British History.
1322 Robert the Bruce of Scotland defeats King Edward II of England at the Battle of Old Byland, forcing Edward to accept Scotland’s independence. Check out the movie The Outlaw King (2018).