Narnia headcanon: Royal romantic dalliances, political marriages, interspecies marriages, and incest

[snacky]

Let's talk about Narnia and all the politics that goes into marriage for the kings and queens! Do the royals of Narnia ever marry for love? Do they marry for alliances and power gains, to secure succession, and have lovers on the side? What about interspecies marriage? We know the first royal family in Narnia did that, but did that practice continue? And what about incest - did the royals ever turn to that to secure the throne, or as a power grab?

I love headcanon and worldbuilding, so please, share yours! Let's discuss in comments how you think it all worked!

ETA: Commentfic or snippets welcomed like woah. :D