The Council of Trent was the 16th century Ecumenical Council of the Roman Catholic Church. It is considered to have been one of the Church's most important councils; it would be over 300 years before the church's next council, Vatican II. The Council issued condemnations of what it defined as Protestant heresies and defined church teachings in the areas of scripture and tradition, original sin, justification, sacraments, the Eucharist in Holy Mass, and the veneration of saints. It issued numerous reform decrees in an effort to answer Protestant disputes. Decrees concerning sacred music and religious art, though inexplicit, were subsequently amplified by theologians and writers to condemn many Renaissance and medieval practices, such as elaborate polyphony, greatly affecting the development of these art forms. The Council also attempted to restrict variations of the Mass found in regional missals and the spread of liturgical texts of doubtful orthodoxy.