Prologue: It is medieval Transylvania. Irineus Daninsky has just slainLord Bathory, head of a coven of witches and worshippers of Satan. His widowElizabeth is holding a Black Mass in order to exact revenge when Daninsky andhis troops crash the ceremony. Later, as the witches are all hung and Elizabethis burned at the stake, she curses Daninsky. One of Daninsky's descendants willaccidentally kill one of the Bathory descendants and set in motion a cursewhich will bring hell on earth to all succeeding generations of Daninskys.Many generations later, Waldemar (the last remaining Daninsky) [Paul Naschy] is out inthe forest hunting a wolf when he accidentally shoots a man (actually awerewolf). This sets in motion the curse, initiated by the man's family ofgypsies, who select one of them, Ilona [Ines Morales], to infiltrate Daninsky's home and makehim fall in love with her. One night, as Waldemar is traveling through theBorgo Pass on his way to Bistritz, his carriage comes upon a Ilona lyingin the road. Waldemar cares for her at his castle until she is well. Waldemar'smaid Malitza [Ana Farra] warns that Ilona is up to no good, but Waldemar has already takenher as a lover. On the eve of Walpurgis, Ilona takes a knife and a wolf's skullfrom her things, calls upon the dreaded Grey Shadow, slits her own wristbaptizing the wolf skull with her blood, and then presses the fangs of the wolfinto Waldemar's chest, just above his left breast. Ilona then runs from thecastle, where she is presently chopped up by the ax of insane murderer JanosVilleya, who has escaped from police custody and gone into hiding on Daninsky'sland.Some days later, as Waldemar is recuperating from his wound and sufferingemotionally from the betrayal and loss of Ilona, he learns that an engineernamed Laszlo Wilowa [Eduardo Calvo] from Budapest has just moved into the area, along with hisblind wife Irina and their two daughters, Kinga and Maria. One day, as Waldemaris hunting for rabbit, he comes upon Kinga hanging from a cliff and crying forhelp. Waldemar helps her down, meets her family, including her precociousyounger sister Maria. As the days pass, Waldemar finds that he is enjoyingKinga's company. Meanwhile, Kinga is falling in love with Waldemar.One afternoon, Waldemar receives a note from Kinga [Fabiola Falcon] in which she asks himto meet her at an abandoned cottage near the mill. Just as Waldemar arrives,she is attacked by the insane murderer. Fortunately, Waldemar saves her,stabbing Janos in the stomach. As Janos runs off, Waldemar turns to Kinga, onlyto find that it is Maria [Maritza Olivares]. In an effort to upstage her older sister, Maria hasdecided to give her virginity to Waldemar. Waldemar tries to resist but, whenMaria disrobes, he sweeps her into his arms. They make love, until the fullmoon rises and Waldemar suddenly changes into a werewolf and kills Maria.Malitza, who has been watching, drags Maria's body into the woods and leaves itto be found as yet another of Janos's victims.Meanwhile, the mark of the werewolf (a red pentagram) has made itsappearance on Waldemar's breast, and he has been changing into a werewolf onthe nights of the full moon, during which he unknowingly kills some villagers.On the very night that Kinga tells Waldemar that she is pregnant, Waldemarkills her father. Blame for the killings has so far fallen on the escapedmurderer, whom some say is a werewolf. Finally, Malitza explains to Waldemarwhat has been happening and tells him about the curse. Malitza promises to takecare of it, so she reveals the truth to Kinga and gives her a silver dagger.One night, some children playing ball discover Janos's body in an advancedstate of decomposition. It becomes apparent to everyone that someone else hasbeen doing the killing, and all eyes turn to Waldemar when they remember how hewas marked by Ilona on the night of Walpurgis. The villagers decide to stormthe castle and kill Waldemar. As the villagers, with their guns and torches anddogs, close in on Waldemar, Kinga gets to him first and stabs him through theheart with the silver dagger.Epilogue: Five or six years have passed since Waldemar's death. Kinga andher son visit his grave, and we are reminded of Elizabeth Bathory's curse --that it will extend to all of Waldemar Daninsky's descendents.Original Synopsis by bj_kuehl.
Output: Question: Who placed the ancient curse of Waldemar's ancestor?, Answer: by a medieval sorceress named Countess Bathory.