Okay, it's official: my memory does more that waver. It has holes.
I didn't remember Owain was Morgana's son. I actually forgot she was given in marriage to Uriens. But things seem a little complicated, aren't they? Uriens and Morgana's must not have been a happy union. How could she return to the convent? Are they "divorced", somehow?

I've already told you I'm not that expert in Arthuriana ;) I know only little about Ywain, and I hadn't spotted his name behind "Owain". He's called Ivano in Italian.