Yeah, you're not misremembering; I meant pre-reformation EH (in fact the narrator tells us that the result of the uproar is an investigation into what's been going on at the school, a round of expulsions and a new head, and it becomes quite a good school).

'he is a king, he has responsibilities and must go home' but not so much 'you promised the pretty girl you'd go back for her'. But then I was a pretty unromantic child.

Yes, likewise - though arguably the getting married is part of his responsibilities, in terms of political stability (not that it did him much good, as far as he knows for most of his life). Poor old Caspian...