Beginning with the Council of Trent in 1545, the Church began the Counter-Reformation in response to the Reformation, a large-scale questioning of the Church's authority on spiritual matters and governmental affairs. This loss of confidence led to major shifts of power away from the Church. Under the popes from Pius IV to Sixtus V, Rome became the centre of a reformed Catholicism and saw the building of new monuments which celebrated the papacy. The popes and cardinals of the 17th and early 18th centuries continued the movement by having the city's landscape enriched with baroque buildings.