There was once a great king of England who was called William the Conqueror, and he had three sons.One day King William seemed to be thinking of something that made him feel very sad; and the wise men who were about him asked him what was the matter."I am thinking," he said, "of what my sons may do after I am dead. For, unless they are wise and strong, they cannot keep the kingdom which I have won for them. Indeed, I am at a loss to know which one of the three ought to be the king when I am...