His responsibilities were first to his king and next to the people on his estates. The king required the people of their courts to perform certain duties as well as serve in the military. If they...
A baron's responsibilities were to provide support for the peasants in which they let land out too. Also, they had Feudal obligations to their King - including providing knights for battle.
Originally, in olden days, a king could rule with barons, who ruled the more day to day problems of their times. They could go to war, negotiate peace, or execute someone in a barons court.
The barons were men of high noble rank, though below the rank of earl, count, or viscount, all of which were below marquess and duke. They were of the lowest rank of peerage, meaning that they were...