I know that Prince Knud of Denmark, younger son of King Christian X, married his first cousin, Princess Caroline-Mathilde of Denmark.
My question is: when was the last time a first cousin marriage occurred in a reigning European house?
Knud and Caroline-Mathilde were married in 1933. In 1937 her sister Feodora of Denmark married her first cousin Prince Christian of Schaumburg-Lippe.
1333
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