Why was the Spanish Inquisition founded?
Islamic Granada and much of the rest of Spain had been a comparatively tolerant place until the late Middle Ages. At that point, when the entire peninsula was ruled by Christians, resentment against Jews and Moslems grew. Most of the later fled to North Africa, but this was less of an option for Jews who found themselves subject to widespread anti-Semitism. Many converted to Christianity but this merely changed prejudice against them from religious to racial and raised the problem of those who had only pretended to convert while continuing to practice their old faith behind closed doors. The Spanish Inquisition was formed to ensure that these conversos stayed converted but swiftly moved on to other areas rather than restricting itself to converted Jews.