Maude de St. Valerie and her eldest son, William, were imprisoned in Windsor Castle and starved to death by King John. Maude had refused to allow King John to hold her sons in order to keep her husband obedient to the king. "Arthur, duke or count of Brittany" and "Braose, William de (d. 1211)," in the Dictionary of National Biography; see also "King John," pg.83, by W. L. Warren; see also "Blood Royal: Issue of the Kings and Queens of Medieval England," pgs. 349-351, by T. Anna Leese.