Board Thread:Questions and Answers/@comment-82.37.177.142-20180109184914/@comment-4598697-20180110161715

Traditionally, it was common for royalty to marry their cousins. For example, Queen Victoria and Prince Albert were first cousins. A few societies, like Ancient Egypt and pre-contact Hawaii, took it even further with royals marrying their siblings (gross!).

Many of the royal couples in the French literary fairy tales are first or second cousins, like in Princess Belle-Etoile and The Bee and the Orange Tree. My OC Isidore L'Orange incorporates that into his character. It's also fairly common in Middle Eastern fairy tales since cousin marriage is common in the region.