My question is: when was the last time a first cousin marriage occurred in a reigning European house? How about a non-reigning house?
I know that Prince Ludwig of Bavaria (elder son of Prince Franz and namesake grandson of Ludwig III, the last king) married Princess Irmingard of Bavaria (eldest surviving daughter of Rupprecht, the last crown prince of Bavaria).
But I'm not sure if this was the last time such a thing happened in a non-reigning dynasty.
1503
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