Joan of the Tower
Joan was the youngest daughter of King Edward II of England and Isabella of France. She was born in the Tower of London on 5 July 1321.  According to the Treaty of Northampton, Joan was married on 17 July 1328 to David the son and heir of Robert I of Scotland at Berwick-upon-Tweed. At the time of the marriage Joan was 7 and David was 4. Their marriage lasted for 34 years.