Are there any cases of royal brothers and sisters marrying?

Question

Are there any cases of royal brothers and sisters marrying?

Answer 1

I know that Henry VIII married his sister-in-law Catherine of Aragon.

Answer 2

As moreover the fact of Aristrocratic people of Europe have been inter married. Not sure exactly which once, But it is marrily the case that many of the Europeans are in some way or another linked to the Queen of Englands house. More info can be found on following websites.

Answer 3

Yep - monarchs of pre-Christian Hawaii.

Answer 4

Before western contact ended the practice, royal Hawaiian brothers and sisters often married (and this is true for much of Polynesia for royalty only).  This led to a lot of birth defects, and they almost died out.

Answer 5

Jean V, Count of Armagnac (1420-1473), married Isabelle of Armagnac (1430-1476), his full sister, apparently with papal dispensation. It was found later that the dispensation was a forgery but the couple had already had three children together, who were barred from the Armagnac succession. They having descendants living today, however.

There is a complication set of marriages between children and adopted children of the Duke of Württemberg-Montbéliard in the eighteenth century but none of those children married their own half- or full blood siblings, although it is complicated enough to lead some to believe that they did.

Answer 6

It is relatively accepted that incestuous marriages were widespread at least during the Graeco-Roman period of Egyptian history. Numerous papyri and the Roman census declarations attest to many husbands and wives being brother and sister.

Some of these incestuous relationships were in the royal family, especially the Ptolemies (Cleopatra of Egypt, who married more than one of her brothers). In some societies, like Ancient Egypt, brother–sister, father–daughter and mother–son relations were practiced among royalty, to keep the "blood line" within the family.

There were probably some brother and sister marriages, but more likely than not, the siblings in question would have been half-brothers and half-sisters (King Tut married his half-sister Ankhesenamun). The royal family, on the other hand, did have more incestuous marriages. The royal blood ran through the females, not the males. To become pharaoh, a man had to marry a royal princess, which would be his sister or half-sister.

The prevalence of brother-sister marriages within the New Kingdom royal family, a custom in obvious contrast to contemporary non-royal marriage patters, appears to have been an attempt to reinforce the links between the royal family and the gods who themselves frequently indulged in brother-sister unions.

Answer 7

Ancient world and some instances in the new world but no european royal houses as far as history is aware

Answer 8

Egypt is the immediate one I can think of, but I think the Greeks and romans did it too

Answer 9

Only, as far as I know, in ancient Egypt.

Answer 10

In Rome. but only among the crazy Emperors.

Caligula married his sister.  I'm pretty sure they were twins, too.  

Eeeeeeeeeeeeewwwwwwwwwwww!

But he was psycho.