Belief that individuals in royal lineages possess a special and qualitatively pure blood. In many societies, maintenance of the purity of royal bloodlines has led to marriagerules that forbid persons of pure blood from mating with outsiders.
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blood (... serology. See for example, blood royal.)
royal endogamy (Sibling marriage in royal families; see dynastic incest.)
blood group (... . Other blood groups include Diego, Duffy, ...)