The king was the maximum leader and below he had the nobles, they were in charge of everything the king needed them, also for wars
THE NOBLES
Nobles needed trained soldiers to defend castles and to give the King when he asked for them.
you have to take care of the king if he asks me to
the soldiers were the ones who most defended the king, they also had a good reward
Further down the frame, were the peasants who were the ones who took care of the soldiers' lands, it was not one of the best treaties but they had meals
on your orders
you have to take care of my territories
Anyone accepting fief was called a vassalA vassal had to obey his Lord of him and fight for him when required.
Land given to knight for service was called a fief