Yeah, I know the betrothal laws - also see one of the reasons the Princes in the Tower were declared illegitimate, Elizabeth Woodville was engaged to someone else when she married Edward. And Isabella, John's wife. Engaged, kidnapped by John (apparently a very common way to get heiresses), *still* considered lawfully engaged to her previous fiancé when John died.

However, John's a pretty good example of how betrothals go out the window if someone richer/more politically astute comes along.

However, I'm not going down this route - partially because nothing of the sort is mentioned in the books, partly because I have too much other stuff going on, and also it strikes me that the current crop of Telmarines are really isolationist.