Titile of this movie

[Esra]

at the beginning of 1980s I had watched a movie about a rich man's revenge from his cheating young wife and her lover. He had made them take responsibility for her lover's wife's death so that they could be free earlier. but they were prisoned life long, and the other woman hadnt really died. the film was set on a greek or italian island. Can anyone remember such a movie? thank you, sorry for bad english.