When King Stephen, who was holding John Marshal's young son 'William' hostage outside the besieged Newbury Castle, sent word that if John did not surrender he would hang the young boy, John responded by saying that he did not care about the child, since he still had the anvils and hammers to produce even finer sons!
However, the king could not bring himself to harm the boy (who was just 5 yrs old), and the young William Marshal would live and grow up to become England's Greatest ever Knight.