Under feudalism, a king gave a fief in return for a vassal’s loyalty and service. The vassal promised to protect the king and fight in his army as a knight. The vassal, in turn, would give part of his fief to people who promised to serve and protect him. The feudal system of government created two main classes of people. The ruling class governed the peasants and engaged in the fighting. The peasants or serfs worked the land to support themselves and their rulers. There was also a third group of people, the clergy, which served the church. The third paragraph suggests which of the following were members of the ruling class?