Feudal Slaves were a class of people in the Middle Ages who were bound to the land and had to serve their lord. SERFS (5 letters) were the lowest class of feudal slaves, and were tied to the land they worked on and could not leave without permission. Esnes (5 letters) were a slightly higher class of feudal slaves, and were allowed to move from one estate to another. VASSALS (7 letters) were the highest class of feudal slaves, and were granted land by their lord in exchange for military service.