The council was convened by Pope Pius IX, who announced his intention in 1864. Because of the Italian political situation (the Papal States were the only bar to a united Italy), the advisability of having a council at all was questioned by the Catholic powers, who traditionally opposed strong action on the part of the church. In 1868 it was widely rumored in Europe that the enunciation of papal infallibility as a dogma was the purpose of the council and that it would confirm the papal denunciations of modernistic rationalism and liberalism. As a result there was a widespread attack on the prospective council in non-Catholic circles of France, Great Britain, and Germany. Within the church several prominent persons denounced the enunciation of infallibility as a dogma. Chief of these were Johann Joseph Ignaz von Döllinger in Germany, Lord Acton in England, and the comte de Montalembert in France.
The council was convened Dec. 8, 1869, in St. Peter's, and it was attended by some 600 of the higher clergy (patriarchs, archbishops, bishops, abbots, generals of orders, and theologians) from all over the world. The Eastern Churches in schism were invited, and the Protestants were officially informed. Late in 1870 the council was brought to a halt by the entrance of Italian soliders into Rome, and a month later the pope prorogued the council indefinitely; it was never reconvened.