Henry VI, Part 5: The Sun in Splendour - S1.E13

The Duke of York was killed by Queen Margaret at Wakefield, but the Yorkists, under their dead leader's son Edward, smashed the Lancastrians in the snow at Towton. Queen Margaret and her son have fled to France. Henry VI is Edward's prisoner. Warwick proclaims the new Duke of York Edward IV and goes to France to arrange a royal marriage, unaware that Edward has already decided to marry the widowed Lady Elizabeth Grey.