Four have already been confirmed, only one will actually get married to him, and she will give birth to his heir. While the MC could bend the laws, it would undermine the rule of his future heir. Most fics that tend to have their MC marry multiple women, seem to forget that they are leaving their Kingdom in a very chaotic situation after their deaths. Of course, just having multiple kids, means they're bound to be in conflict in the future, so Erlend will introduce both legal and magical means to avoid it.
ASOIAF: Lord of Nature
หนังสือและวรรณกรรม · FitzMagna
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