Consanguinity
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Consanguinity is the characteristic of having a kinship with a relative who is descended from a common ancestor.
Consanguinity of the kings of France as shown in Arbor genealogiae regum Francorum (Bernard Gui, early 14th century)
Incest
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Incest is sexual activity between close relatives, such as a sibling or parent. This typically includes any kind of sexual activity between people in consanguinity, and sometimes those related by line
Consanguinity
…to jurisdiction. In some communities and time periods, cousin marriage is allowed or even encouraged; in others, it is taboo, and considered to be incest. The degree of relative consanguinity can be illustrated with a consanguinity table in which each level of lineal consanguinity (generation or meiosis…
Woodcut illustration depicting incest between Semiramis and her son Ninias
Egyptian king Tutankhamun married his half-sister Ankhesenamun.
Maya king Shield Jaguar II with his aunt-wife, Lady Xoc AD 709
Charles II of Spain was born physically disabled, probably due to centuries of inbreeding in the House of Habsburg, and suffered a particularly pronounced case of Habsburg jaw