Peasants being required to work land leased to them by nobles in exchange for military protection are a part of a caste system.

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Quizplus · Accepted Answer

This description refers to the feudal system, not a caste system. The feudal system was a social and economic structure in medieval Europe where peasants worked land for nobles in exchange for protection, whereas a caste system is a form of social stratification characterized by hereditary transmission of a lifestyle which often includes an occupation, status in a hierarchy, and customary social interaction and exclusion based on cultural notions of purity and pollution.

Peasants Being Required to Work Land Leased to Them by Nobles