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Re: Double cousins
User logged in as Robert
I guess the Royals didn't study genetics before marrying their close relatives
Isabel II of Spain and her husband Francisco were double cousins.
I believe there might be several other examples in the Iberian royal dynasties as well as in the various branches of the Bourbons, Habsburgs and maybe the Wittelsbachs.
Can anybody provide a list of marriages involving such persons? I believe that Holy Roman Emperor Francis II was married to one, and suspicions were raised that this was the reason for the birth defects of some of his children ...