At the top, you would have a king. Now the king would rule over a kingdom. Now, this is not so easy to govern especially during the middle Ages. And the king might owe many people, things especially people who help the king come to power, helped him dispose of the previous king or to conquer this land. And so in exchange for that and to help govern, he might grant land or feasts to other people. And the key currency in the Middle Ages under the feudal system island. And land in exchange for loyalty and service. So this whole thing is a kingdom. Now right over here, this is a Duchy. And a Duchy will be controlled by a Duke. I guess I didn't call it duckie because that justice doesn't sound as serious. So the king might grant a Duchy, a Duchy to a Duke and in exchange, the Duke would provide loyalty pledged their fealty. If the king is threatened, the Duke will fight alongside.