The main social classes of feudalism included monarchs, bishops, nobles, knights, and peasants
Explanation: monarchs.a sovereign head of state, especially a king, queen, or emperor. bishops. a senior member of the Christian clergy, usually in charge of a diocese and empowered to confer holy orders. nobles. a person of noble rank or birth. knights. a man who served his sovereign or lord as a mounted soldier in armor. peasants. a poor farmer of low social status who owns or rents a small piece of land for cultivation (chiefly in historical use or with reference to subsistence farming in poorer countries).
You must understand and consider the consequences of an event before making a historical interpretation. So you understand the impacts that particular event had.