when did the catholic church stop using latin
Latin Mass Neither the Second Vatican Council nor the subsequent revision of the Roman Missal abolished Latin as the liturgical language of the Roman Rite: the official text of the Roman Missal, on which translations into vernacular languages are to be based, continues to be in Latin, and Latin can still be used in the celebration.[5] The term "Latin Mass" is sometimes applied to such celebrations, which in some places are part of the normal Sunday schedule.
Papal infallibility This doctrine was defined dogmatically at the First Ecumenical Council of the Vatican of 1869â€“1870, but had been defended before that, existing already in medieval theology and being the majority opinion at the time of the Counter-Reformation.[3]