The liturgical renewal of the Second Vatican Council was grounded in centuries of Church tradition, in the Council of Trent, in the writings of the popes of the 20th Century, and in developing scholarship and practice throughout the world.
The first document promulgated by the Second Vatican Council was the Constitution on the Sacred Liturgy. This document is one of only four constitutions issued by the council. Constitutions are the most authoritative and important documents issued by the council.