The most trustworthy knight

A king is about to set out on a journey far away from his home, and must leave his wife behind, but is worried about her faithfulness. He asks the local blacksmith to create a chastity belt that will keep his wife faithful, and so the blacksmith gets to work right away. The blacksmith brings the king a set of metal undergarments with a lock in the back, and a large hole in the front. The king asks why the blacksmith would leave a hole in such a spot. The blacksmith proceeds to get a short stick, and place it in the hole. Immediately, the end of the stick is chopped off by a blade within the hole. The king is impressed, so he leaves on his way after giving the undergarments to his wife. On the day the king returned, he assembled all of his knights in a line, and told them to drop their pants, in order to see who had tried to have their way with his wife. To his displeasure, the king saw that all down the line, every knight had lost his member to the blade, with the exception of one. The king congratulated the knight on his trustworthiness, and asked that he be made the new general in his army. The knight simply shook his head. The king asked again, and again the knight simply shook his head. Confused, the king asked the knight why he refused to accept such an honor, only to have the next knight in line turned to the king and say, "Forgive him, your majesty, he has had trouble speaking since his tongue was chopped off."