如何精簡的回答？ Describe the feudal system in medieval Europe. Describe the manor system in medueval Europe. Describe the cgivalric code and the life of a medieval knight. Describe the power of popes and the power of kings. what do medieval kings control? what do medieval popes control? why did popes and kings fight with each other? Describe the crusades by answering the following questions: what were the crusades? when did they happen? why did the crusades happen? who was involved? where did the crusdes happen?