Uther attempts to cover up his
             deception by sending Arthur away to be raised by Sir Ector, who teaches him
             the codes and skills inherent in being a knight. This is then why Arthur
             is do deeply shocked and disillusioned when finding out the truth about his
             Arthur, without realizing the magnitude of what he does, extracts
             Excalibur from the stone through an act of loyalty. He does this to ensure
             that his brother Kay has a sword to fight with. When the truth is revealed
             to him, he is at first shocked and dismayed for the above-mentioned
             reasons, before allowing himself to be pleased with his kingship. Loyalty
             thus plays a bigger role for him than prestige. And this is also a quality
             that he instills in the Knights of the Round Table.
             Arthur's loyalty is again shocked much later when Guinevere and
             Lancelot, the two people most expected to be loyal to the king, enter into
             an illegitimate relationship. Loyalty is an essential part of chivalry, as
             the lack thereof leads to a devastation of the rational thought necessary
             for effective bravery. This can also be seen in the above-mentioned fight
             ...