Steven Mitchell Ferry -- Wolcott, as you state, calls this man historical -- I'm ok wiith that.
But like Caswallon, he's an historical man who has been included in the Mabinogion.
My proposal is to detach him from his daughter.
Do we have evidence that the daughter is human? Because if so, we should make her non-Fictional, and detach her from her godly father.
When we do that, we put links and explanations in the profiles, so that their connection to the Mabinogion can be followed.