The Devils Wedding Night 1973 Italian horror film.

Two rival brothers are looking for the magic ring of the Nibelungen, a mystical jewel that confers all power to the one who possesses it. The first, Karl, is an archaeologist who wishes to give it to an archaeological institute; the second, Franz, is a materialist who wants to appropriate it to be rich and powerful. Franz, after having read Karl's research, travels to the Carpathian Mountains in Transylvania, to the ancient castle of Count Dracula. After Karl and the ring of the Nibelungen, went missing Karl goes looking for his brother.