... that the barons could not easily rise against him by giving them pieces of land in different parts of the country, which made it difficult to raise a private army in secret.This system of duties and rewards was called the feudal system. In Normandy, when barons and bishops were given land they had to swear an oath of loyalty to the lord who was giving the land. This process of oath making was called doing homage. The barons who received land became tenants and chiefs. The more land that they received the more knights that they had to provide for the king. Tenants and chiefs sometimes had the knights living with them inside their castles and some chose to give some of the land to the knights who then in return did homage and agreed to fight whenever called upon by the tenant and chief who gave them the land. ...

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