Feudal slaves were people in the Middle Ages who were bound to a lord and had to perform labor in exchange for protection. The three most common types of feudal slaves were helots, serfs, and esnes. Helots were slaves in ancient Greece who were owned by the state and were required to pay a portion of their produce to their masters. Serfs were peasants in medieval Europe who were bound to the land and had to provide labor and a portion of their produce to their lords. Esnes were slaves in medieval England who were owned by a lord and were required to provide labor and services in exchange for protection.