What is a midevil system in which people were organized according to wealth and power?

The medieval system in which people were organized according to wealth and power is known as feudalism. In this hierarchical structure, society was divided into distinct classes, including kings, nobles, knights, and peasants. Land ownership was central to this system; lords granted land (fiefs) to vassals in exchange for military service and loyalty, while peasants worked the land in return for protection and sustenance. This arrangement created a rigid social order that defined the roles and relationships among the different classes.