Mother Joan of the Angels
Matka Joanna od Aniolów (original)
Set in the 17th century. A convent in a small town is being visited by high-ranking Catholic official trying to exorcise the nun supposedly possessed by demons. A local priest have been burnt for creating this condition by sexual temptation of the nuns, especially the Mother superior who bring on the collective hysteria of the group. There is another young priest who is to help with the exorcism. His first meeting with the convent head, Mother Joan of the Angels, has her seemingly possessed by Satan - she yells blasphemies and incites the priest. She begs the priest to save her and to help her to be a saint.
Starring Lucyna Winnicka, Mieczysław Voit, Anna Ciepielewska, Maria Chwalibóg, Kazimierz Fabisiak, Stanisław Jasiukiewicz, Zygmunt Zintel, Jerzy Kaczmarek, Franciszek Pieczka, Jarosław Kuszewski
Watch "Mother Joan of the Angels" on Mubi released in 1961. It's a drama and mystery movie, and has a rating of 7.5 out of 10 from Imdb which is usually fine for this kind of movie.