This church is the mother of the Society of Jesus, better known as the Jesuits. Its baroque facade was revolutionary in its day – it was the first time the baroque style had been introduced to architecture. Construction began on the church in 1568 and was completed 22 years later. Its design set a pattern for Jesuit churches built for centuries afterward, and influenced architecture in other Catholic churches as well. The gorgeous frescoes on the ceiling and the nave were painted by Giovanni Battista Gaulli.