The Council of Trent was the 19th Ecumenical Council of the Roman Catholic Church. Considered one of the Church's most important councils, it convened in Trent for three periods between December 13, 1545, and December 4, 1563, as a response to the Protestant Reformation.
(New World Encyclopedia)
The following blog post is from Padre Perigrino (Fr. Nix):
http://padreperegrino.org/2017/12/05/trent/
