Why did Frederick the Great examine the quarterings of his courtiers?

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Frederick the Great examined the quarterings of his courtiers to verify their nobility through the doctrine of seize quartiers ("16 quarters"). This Continental heraldic principle required an individual to prove that all 16 of their great-great-grandparents were entitled to bear arms, serving as a rigorous test of noble ancestry.1

This practice reflected the rigidity of the European noble caste, which typically married only within its own social stratum to maintain its status. Although Frederick the Great professed the ideals of the Enlightenment, his diligent scrutiny of these quarterings underscored the persistence of traditional aristocratic structures in his kingdom.1