deFining Feudalism

The Vikings, Muslims and Magyars were attacking Europe.  Kings were too weak to protect the people and maintain order, because of this they granted nobles use of land from Royal Estates.  Nobles were respected, meanwhile peasants were not.  Every peasant had to give 1/3 of their produce to the King for protection by the kings knights.  There were also taxes that the peasants had to pay.  Let us not forget the serfs who were legally bound to the king's land with feudalism.