The Council of Trent is reckoned by the Roman Catholic Church to be the Nineteenth Ecumenical Council held from December 13, 1545 to December 4, 1563. It was held in the Italian city of Trent. It is considered one of the most important councils in the history of the Roman Catholic Church, establishing church doctrine in response to the Reformation and condemning Protestantism. It clearly specified Catholic doctrines on salvation, the sacraments, the biblical canon, and standardized the Mass throughout the church, largely abolishing local variations. This became called the "Tridentine Mass", from the city's Latin name Tridentum.