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 (imdb)

THE DEVIL'S POSSESSED-1974-Baron Gilles de Lancre (Paul Naschy) hires Simon (Eduardo Calvo) the alchemist to teach him how to make gold from glass. At first Gilles is reluctant to help the alchemist because it requires a human sacrifice. However, with some urging from his consort Georgelle (Norma Sebre), he overcomes his misgivings, and a local cutie is killed. Later Gaston Malebranche (Guillermo Bredeston) returns from the war and has a fight with some hooligans in a bar. The Baron uses murder and torture to keep everyone in check while searching for the philosopher's stone. His Georgella says the devil will talk to him through a severed head, so he has a local boy decapitated. The head does talk to him and tells him to sacrifice some virgins but the voice is actually that of the alchemist who is obviously in cahoots with Georgelle. 

Later Gaston, who once saved the Baron's life, is more than welcomed in the Baron's castle but Georgelle doesn't like him and says he should be killed. When an assassination fails, Gaston joins the underground peasants who oppose the Baron. After losing a jousting match to Gaston and killing the alchemist because he failed to produce the philosopher's stone, the Baron and his army go on a killing spree. Later he thinks he's invulnerable, but his enemies prove him wrong. 

This great historical bloody horror film was written by star Naschy under his real name Jacinto Molina as he once again teamed the director Leon Klimovsky (THE WEREWOLF VS. THE VAMPIRE WOMAN, DR. JEKYLL VS. THE WEREWOLF). The story is loosely an adaptation of the life of Gilles de Rais, a 15-century notorious French serial killer who had serves under Joan of Arc. Read about him here:

https://en.wikipedia.org/wiki/Gilles_de_Rais

Thanks for reading!