King D.Sebastião of Portugal had 4 great-grand-parents instead of the regular 8.
http://roglo.eu/roglo?lang=pt&m=A&i=600581&sosab=10&t=N&bd=0&color=&evt=on&v=4
It would have been strange for the King and Queen to oppose a marriage between their oldest son and Princes Märtha on the grounds of them beeing too closely related - when they had allowed their youngest son to wed his cousin Princess Caroline-Mathilde.
If the union simply involves first cousins, it shouldn't be an issue. But oftentimes, one has multiple generation first cousin marriages: that's when one has excessive inbreeding. The fact is that King Frederik IX of Denmark was a descendant of King Oscar I of Sweden, just like Princess Martha -- not to mention the fact that they had a closer relationship as children of a brother and sister.
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