7: Incan Incest
Intermarriage existed during the later years of the Incan Empire. While marriage between blood relatives was prohibited for the general population, nobles were exempted from this rule because they were above human law and different than their fellow men.
At first, it was common to marry half-sisters so that the common grandfather’s line would be strengthened. Problems arose in terms of succession because rulers tended to have more than one wife, mistress, and concubine. As a result, people began to believe that children with two parents of royal blood instead of one would have a stronger claim to the throne.
Rules were established when Incan emperor Pachacuti chose a younger son, Thupa Inka Yupanki, over another for his military skill. Thupa’s female sibling was called a full sister, not a half-sister, to strengthen the rights of her future sons. The changes did not have a lasting effect. Thupa Inka Yupanki’s brother attempted a coup anyway, and the lineage was lost to civil war one generation later.
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