Blood Vow

Magic has been banned from Camelot. And they are also trying to push it from other kingdoms, including Targaryen. But the kingdom of Targaryen specializes in magic, and dragon riding. Until king Uther ordered the Knights of Camelot to kill all the dragons. Both kingdoms are now thirsty to destroy each other, and bring a Great War. But King Uther doesn't want that. So to avoid a terrible war, and to get his rival kingdom to stop using magic, he comes up with an idea. A peace treaty. That involves Arthur and the heir to the throne in Targaryen, princess Freya. An arranged marriage.