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In the official novel it’s insinuated that, Miriam r-words Sabelian multiple times. Even though Miriam and her family were happy they were in a pretty good position in the kingdom now, they wanted something completely solidified. A daughter was not really seen as an heir to the throne so, Miriam would only see Sabelian at night to try for a son.
Obviously she died without giving birth to a son. This is also why Blanche’s maternal grandfather, (forgot his name lol) is trying to give his youngest daughter to Sabelian.