![]() The authors analysed 331 European monarchs between 9. ![]() Assuming that countries’ propensity for incest did not vary based on their political fortunes, the periods in which they had highly inbred (and probably dim-witted) leaders occurred at random intervals. In theory, each round of inbreeding should have made monarchs slightly stupider-and thus worse at their jobs. It also led to the copying of recessive genes, which can cause rare diseases and reduce cognitive ability. ![]() ![]() This practice, at which Charles’s Habsburg clan excelled, kept power and titles closely held. For centuries, European nobles often married close relatives.
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