Responses

He knows that he's his son. Noah's mother (headless lady,a witch btw) was infertile but he raped her and with his powers (idk how exactly) he got her pregnant. That's why after killing her he prevented her soul from staying inside Noah (since children of witches gain their powers from swallowing their mother's soul) and like that he was able to keep him as an empty shell that he could have for himself when the right time came and be able to rule over the country since the king is under his power already. The whole sex thing was the ritual through which he took over noah's body.
The headless lady said she was raped by Sigmund so wht was that's uppose to mean?