Okay, this is a bit of a long shot but I remember watching a film (several times!) on TV back in the 80's and I've tried Googling it but with no joy.
It's set in an old house/mansion near some cliffs. The characters are maybe based on Greek mythology (Titans?) one of whom suffers the Promethean fate of having his liver pecked out by birds (my memory says seagulls) on the beach. Possibly made in the 60s/70s, possibly European and watched on a black and white TV so I can't even tell you if it was a colour film or not.