Probably the best-known example would be Prince Albert of Saxe-Coburg and Gotha, who in 1840 married his first cousin, Queen Victoria of Great Britain.
Their kinsman, Prince Gaston of Orléans, married Isabel, the Princess Imperial of Brazil
Prince George of Denmark (1653-1708) was born the third son in his family (his father being King Frederik III); but because one of his older brothers died in infancy, he might count as a second son. In any case, he was married to Queen Anne of Great Britain.
Are there other examples? What about the early pre-Spanish kingdoms or Navarre?
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