This was a fantasy/medieval movie from the early 80s or late 70s, perhaps. There was something about a sacrifice or a forced marriage of a virgin(s) or princess. When someone turns the table on the head priest or king who has been in charge of this, he declares something like “If I cannot, none shall” and tries to kill her.
I assumed it was Dragonslayer (1981) but I cannot find that scene in the film.