There appears to be something equally dodgy in the backstory of King Jiol and the mother of his daughter Sheema-- not so much an arranged marriage as "I want, I take." Yikes.

I think Shimizu Hitomi was the one who came up with "he snapped up some random lady to bear him a child" theory, but I believe this. He saw a woman who looked desirable enough, told her she was going to be his bride and since he was the fucking king she couldn't exactly say no. I definitely believe there was "I want, I take" but I can also see the woman thinking "well at least I'll be marrying into status". Possibly to ignore the fact that he was just snapping her up.