And there's some place in between a free peasant and a slave. They are bonded to the lord of the manor. In this case, it would be a duke, but you could go down this hierarchy. You could have a manor where the lord is a baron or the lord is a knight or the lord is just someone who is very wealthy and somehow got access to a fiefdom. So the serfs are bonded to the land. They can't leave without their permission. They are allowed to cultivate certain tracts of land themselves, but they also have to work for their lord.