In which social system is one class required to protect another, that gives a portion of its agricultural labour and crops in return?

Question

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Feudalism is a social system in which a lord or noble is granted land by a monarch in exchange for military service and protection of the peasants who work the land. The peasants, also known as serfs, give a portion of their agricultural labor and crops in return for the protection of the lord.

In Which Social System Is One Class Required to Protect