It's usually one or two factions that are very accepting, while the rest is completely unaccepting. The Sicillians and the Danes are two factions that usually accepts. Works often until late game at least and I got confirmation on one marriage in the ultimate endgame. Good old memories.
I think it has a lot to do with invasion protection, while having no way (or at least thought) to invade you. One good reason to have those isolated factions left as allies (even if requesting marriage doesn't give an alliance iirc).
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