In Europe after the fall of the Roman Empire,what system emerged that emphasized the reciprocal ties between a king and his vassals,and between a lord and his serfs?

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Feudalism emerged after the fall of the Roman Empire in Europe. Feudalism emphasizes the reciprocal ties between a king and his vassals, and between a lord and his serfs. Under feudalism, vassals would swear loyalty and provide military service in exchange for land and protection from their lord. Serfs would work the land and provide labor in exchange for protection and the use of land. This system was based on a hierarchical social structure and was prevalent in medieval Europe.

In Europe After the Fall of the Roman Empire,what System