Maria Cagiano de Azevedo, Bishop of Senigallia, Papal States Filippo de Angelis, Archbishop of Fermo, Papal States Paolo Polidori, Prefect of the Sacred Congregation of the Council, Titular archbishop of Tarsus Luigi Ciacchi Historic features of 1846 Conclave: last of three conclaves held in the Quirinal Palace and last held outside the Vatican election of pope who would have the second-longest reign in papal history last conclave held during the existence of the Papal States apparent victory for liberals and apparent rejection of previous pope's policies failed attempt by Austrian emperor to exercise a veto last conclave made up exclusively of cardinals from continental Europe Notes References 1846 in the Papal States 1846 1846 elections in Europe 19th-century Catholicism 1846 in Christianity June 1846 events