When Dorne became one of the Seven Kingdoms, they agreed to replace the Westeros Law of Inheritance with the Dornish Law, so that the same laws would be followed throughout the realm. Or, Five times there was no male primogeniture in Westeros, and this wasn't as helpful as you might expect.

In which Tsuna isn't Tsuna but Tsunako, and lived with her parents in Italy for a few years before circumstances made moving to Namimori seem advisable. And changes spiral out from there. For the prompt Xanxus/Tsuna - genderswap; "don't look down on me because I'm a woman."

Lyanna Stark thwarts a kidnapping, and receives an interesting offer.

It was Wei Wuxian’s idea, of course. Jiang Yanli’s big didi was brilliant and talented beyond measure, as reckless and impertinent in his thoughts as he was in every other way, just as her little didi was earnest and soft-hearted and dutiful, the outlines of the serious man he’d become when he grew up just barely visible underneath the baby fat that still lingered in his cheeks. It was Wei Wuxian’s idea, but it was Jiang Cheng that made Jiang Yanli decide to use it.

King's Landing swallows Dornish princesses and chokes on their bones.