The Spanish Inquisition happened because the monarchs of Spain wanted to ensure that people who were converting to Christianity from Judaism or Islam were sincere, and anyone who was believed not to be sincere was punished. The period is considered an ugly period by many, reports Catholic Magazine and the Jewish Virtual Library, as the methods used to question converters were filled with cruel acts of violence.
Since so many people had been forced to convert to Christianity to save their lives, the Spanish Inquisition allowed the rulers to determine whether or not newly converted Christians were still practicing their old faiths and lasted for 354 years. The primary victims were Jewish, Muslim and Protestant. The Spanish Inquisition did not end until 1834.