Lords of the White Castle

Based on a true story - the Fitzwarin family were Welsh Marcher barons, feuding for decades with the de Powys family over the ownership of Whittington Castle. Fulke is a squire who alienates Prince John when he beats him at chess and jousting. King Richard agrees Whittington Castle belongs to the Fitzwarins and starts the official paperwork, but dies before it is finished. King John is happy to reverse the decision and give it to the de Powys family. Fulke fights Morys de Powys and is wounded. He is nursed back to health by Mathilda, whom he's known since childhood and who is married to a man much older than herself, though he is ill. Fulke and Mathilda eventually marry and continue the fight for the Fitzwarin home.