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As some szlachta were poorer than some non-noble gentry, some particularly impoverished szlachta were forced to become tenants of the wealthier gentry. In doing so, however, these szlachta retained all their constitutional prerogatives, as it was not wealth or lifestyle (obtainable by the gentry), but hereditary juridical status, that determined nobility.

What was one noble thing the poor szlachta did?
retained all their constitutional prerogatives