Under the king were powerful nobles, who were granted land in exchange for military service and loyalty. These nobles were known as lords, and they managed their own estates, which were often quite large. The next level down in the hierarchy were the knights, who were usually the younger sons of nobles and served as the military force for the lords. Knights were granted land in exchange for their service, and they lived in fortified castles.
The lowest level of society was occupied by the serfs or peasants, who were tied to the land and could not leave their lord's estate without permission. Serfs worked the land and provided labor for the lord and his family.
Overall, medieval feudal society was characterized by a strict hierarchy of social classes, with each class having its own specific rights, responsibilities, and privileges.