There technically is no "Roman" Catholic Church, the Catholic Church has been around for twenty centuries and has had dozens of ecumenical councils in that time. You would have to narrow it down to a specific time period.
The Church leaders met in the city of Trent, for the council of Trent.
Vatican Council
Counter-Reformation
The gathering of Italian Bishops to discuss the Catholic response to the Protestant Reformation was called the Council of Trent.
It was the Catholic response to the Protestant reformation (also called the Counter-Reformation). It involved greater emphasis on the central power of the papacy, the clarification of a number of core doctrines and the refutation of Protestant beliefs at the Council of Trent, and the growth of popular religious movements at grass-roots levels such as the Society of Jesus to promote Catholic doctrines and root out heretical beliefs.
the reformation
Protestant Reformation
the catholic church and started a new church called the lutheran church
Counter Reformation 16th-century reformation that arose largely in answer to the Protestant Reformation; sometimes called the Catholic Reformation. Although the Roman Catholic reformers shared the Protestants' revulsion at the corrupt conditions in the church, there was present none of the tradition breaking that characterized Protestantism. The Counter Reformation was led by conservative forces whose aim was both to reform the church and to secure the its traditions against the innovations of Protestant theology and against the more liberalizing effects of the Renaissance.
The movement is called Protestant Reformation or the Protestant Revolt.The Protestant Reformation
It is called the Reformation
Catholics called them heretics, they called themselves protestants.
The Council of Trent
The major goal was to try to undo the damage done to the Catholic church by the Protestant reformation. The Council of Trent was called specifically for this purpose. Unfortunately, the Council did as much harm as good in this respect.