Vatican Council I

Vatican Council I, held from 1869 to 1870, was the first ecumenical council of the Roman Catholic Church since the Council of Trent. It aimed to address modern challenges to the Church and clarify its doctrines. The council is best known for affirming the doctrine of papal infallibility, which means that the Pope is considered incapable of error when proclaiming dogma on faith and morals. It also addressed the relationship between faith and reason. The council was cut short due to the Franco-Prussian War but had a lasting impact on Church governance and its approach to modernity.