This church, located in the square of the same name, was once the scene of the so-called Autos de Fe, punishments against heretics that the Inquisition preferred to perform in public. The surrounding area is now one of the most populous neighborhoods in the city, and is no less dangerous. The church and school were dedicated to a very particular saint: Fernando III, King of Spain, nicknamed 'The Saint' because he evicted the Muslims, Jews and other so-called heretics who were living peacefully in the Iberian Peninsula. The church's façade was constructed in volcanic tezontle, with a Baroque stone entrance. The original Baroque altarpieces were destroyed, but copies were made afterward.