The three Richards who ruled England in the Middle Ages were among the most controversial and celebrated of its rulers. Richard I ('Coeur de Lion', 1189-99) was a great crusading hero; Richard II (1377-99) was an authoritarian aesthete deposed by his cousin, Henry IV, and murdered; while Richard III (1483-85), as the murderer of his nephews, 'The Princes in the Tower', was the most notorious villain in English history. This highly readable joint biography...