Convened intermittently since 1545, the Council of Trent issued sweeping decrees on scripture, sacraments, clerical discipline, and art, forming the backbone of the Counter-Reformation. Its final session under Pope Pius IV settled doctrines that would define Roman Catholic practice for the next four centuries, drawing a firm line against Protestant theology on justification, the sacraments, and papal authority.
The Council of Trent was less a single meeting than a marathon negotiation stretched across eighteen years, three popes, and repeated political interruptions from war and plague. Bishops, theologians, and cardinals gathered in the northern Italian city of Trento to answer the challenge Martin Luther had posed decades earlier: was salvation by faith alone, and did the Church's rituals and hierarchy have any real authority?
Trent's answer was an emphatic reaffirmation of tradition. It upheld the seven sacraments, transubstantiation, and the necessity of good works alongside faith, while also cracking down on the corruption that had fueled Protestant anger — banning the sale of indulgences, tightening rules on clerical residency, and mandating seminaries to properly train priests.
The final session on this day produced a flurry of decrees, quickly ratified by Pope Pius IV. The council's rulings shaped Catholic liturgy, art, and education for centuries, standardizing the Latin Mass and inspiring the ornate, emotionally charged aesthetic of Baroque churches built to inspire awe and reaffirm the faith Rome feared was slipping away.