The Politics of the Counter-Reformation

In October 1517, Martin Luther sent a list of theological objections to the Archbishop of Mainz. Within three years they had fractured Western Christianity. The Catholic response took decades to cohere, and when it did, through the Council of Trent, the Inquisition, and new religious orders, it was as much a political program as a theological one.

The Council of Trent met in three sessions between 1545 and 1563, convened by Pope Paul III and concluded under Pius IV. Its decisions rejected Protestant positions directly: salvation required both faith and works, tradition held authority alongside scripture, and seven sacraments constituted the core of Catholic practice. It also reorganized clerical discipline, requiring bishops to reside in their dioceses and establishing seminaries.

Enforcement followed quickly. In 1542 Paul III reorganized the Roman Inquisition into a body capable of pursuing heresy across Catholic Europe, and in 1559 Paul IV published the first Index librorum prohibitorum (Index of Prohibited Books), condemning the complete writings of nearly 550 authors. It remained in force until 1966.

The Church also went underground for evidence. Protestant historians, above all the authors of the Magdeburg Centuries, argued that the papacy was a medieval corruption of apostolic Christianity. Rome answered with archaeology. In May 1578 laborers digging for pozzolana outside the Porta Salaria broke into an intact early Christian cemetery. Cesare Baronio, whose Annales Ecclesiastici answered the Magdeburg historians volume by volume, was among the first to visit; Antonio Bosio spent thirty-six years mapping the catacombs and produced Roma Sotterranea, the first treatise on them. Trent’s final session in 1563 had defended sacred images and the veneration of relics and martyrs, which Protestant iconoclasts rejected as accretions. Burial chambers of the third and fourth centuries, painted with figural scenes and holding martyrs’ graves, let Catholic scholars argue that both were as old as the Roman church itself.

The Society of Jesus, approved in 1540, put that decree to work. Between 1581 and 1583 Niccolò Circignani frescoed martyrdom cycles for three Jesuit colleges in Rome, engraved soon after by Giovanni Battista Cavalieri and circulated across Europe. One was the English College, founded in 1579 to train priests for Elizabethan England, where the Catholic priesthood was a capital offense. Its walls showed ancient Roman martyrs alongside Edmund Campion, hanged at Tyburn in 1581, so that third-century persecution and the deaths its students could expect formed one sequence. Roman religious art worked this material for seventy years, from Caravaggio’s chapel commissions of 1599 to Bernini’s Cornaro Chapel of 1652.

The division these arguments defended took military form in 1618, when a revolt in Bohemia grew into the Thirty Years’ War. The Peace of Westphalia in 1648 confirmed that each territory would follow the faith of its ruler. Catholicism had lost England, Scandinavia, the northern Netherlands, and much of Germany. What Trent built in their place was an apparatus: the Roman Catechism of 1566, a standardized breviary in 1568 and missal in 1570, and from 1588 a Curia divided into fifteen permanent congregations. The Church controlled less of Europe than it had in 1500, but it governed the areas it still controlled much more strictly.

FURTHER READING

1. O’Malley, John W. Trent: What happened at the council. Harvard University Press, 2013.
2. Bireley, Robert. The Refashioning of Catholicism, 1450-1700: A Reassessment of the Counter-Reformation. Bloomsbury Publishing, 2015.
3. Ditchfield, Simon. Liturgy, sanctity and history in Tridentine Italy: Pietro Maria Campi and the preservation of the particular. Cambridge University Press, 2002.
4. Noreen, Kirstin. “Ecclesiae Militantis Triumphi: Jesuit Iconography and the Counter- Reformation.” The Sixteenth Century Journal, vol. 29, no. 3, 1998, pp. 689–715. JSTOR, https://doi.org/10.2307/2543684. Accessed 2 Aug. 2026.
5. Fragnito, Gigliola, ed. Church, censorship and culture in early modern Italy. Cambridge University Press, 2001.