教皇不可謬説
The council, also known as Vatican I, was convened by Pope Pius IX in 1869 and had to be prematurely interrupted in 1870 because of advancing Italian troops. In the short time, it issued definitions of the Catholic faith, the papacy and papal infallibility. Many issues remained incomplete, such as a definition of the Church and the authority of the bishops. Many French Catholics desired the dogmatization of Papal infallibility and the assumption of Mary in the ecumenical council.