Concept

Council of Trent

Intro

"Eighteen years, three sessions, four popes, two emperors, and one shrinking northern half of Europe lost to Protestantism. The Catholic Church needed to decide what it actually believed and how it actually ran. Trent is where it did both."

The Council of Trent was the Catholic Church's official answer to the Reformation. It met across three sessions (1545 to 1547, 1551 to 1552, 1562 to 1563) in the small north-Italian city of Trent, just south of the Alps, chosen because it was inside the Holy Roman Empire (which the Emperor wanted) and inside Italy (which the Pope wanted). It was the 19th ecumenical council recognized by Catholics, and it shaped Catholic theology, worship, and discipline for the next four hundred years.

Two things came out of it, running together. Doctrinal definitions against the Protestant Reformers: on Scripture, justification, the sacraments, the canon of Scripture, purgatory, indulgences, and the veneration of saints. And disciplinary reforms the Catholic reform party had been requesting for over a century: seminaries to train priests, bishops actually living in their dioceses, an end to one man holding multiple bishoprics, a standardized Latin liturgy, a catechism for parish use, and a Catholic Bible commentary tradition rooted in the Vulgate.

The council was repeatedly almost called and then delayed. Catholic reformers had been demanding a general council since the 1520s; Charles V (Holy Roman Emperor) had been pressuring Rome for one. Popes had been resisting because they worried the bishops would revive conciliarism, the late-medieval idea that a council outranks the Pope. Paul III finally convened it in 1545. The council met, was suspended over an outbreak of typhus and political disputes (1547), resumed in 1551, was suspended again over the Princes' War, and finally completed under Pius IV in 1562 to 1563.

The doctrinal decisions were decisive against the Reformers and remain Catholic teaching. On Scripture, Trent affirmed that Scripture and apostolic Tradition together are the sources of revelation, against the Reformers' sola scriptura. On the canon, Trent included the seven Deuterocanonical books (Tobit, Judith, Wisdom, Sirach, Baruch, 1 and 2 Maccabees) and additions to Esther and Daniel that the Reformers had moved to a separate "Apocrypha" section or removed. On justification, Trent defined a process of inner renewal through cooperation with grace, beginning at baptism and continuing through the sacraments, against the Reformers' forensic sola fide. On the sacraments, Trent affirmed all seven (baptism, confirmation, Eucharist, penance, anointing of the sick, holy orders, matrimony) and reaffirmed transubstantiation as the proper way to describe Christ's presence in the Eucharist. Purgatory, indulgences, and the veneration of saints and relics were all retained, though the financial abuses of indulgences were reformed away.

The disciplinary side did real work the church desperately needed. Seminaries were required in every diocese for training priests; this is where the modern Catholic seminary system started. Bishops were required to reside in their dioceses and stop collecting income from sees they never visited. Episcopal pluralism (one man holding multiple bishoprics) was abolished. The Latin Vulgate was authorized as the standard text of Scripture for Catholic use. The Tridentine Mass (the Roman Missal of 1570) and Breviary (1568) standardized liturgy across the Catholic world; the Tridentine Catechism of the Council of Trent (1566, often called the Roman Catechism) gave parish priests a teaching text.

The lasting impact was huge. The Tridentine settlement defined Catholic life for four centuries. The Mass was celebrated in essentially Trent's form (the "Tridentine Mass" or "Traditional Latin Mass") in every Catholic parish in the world until Vatican II's 1969 reform produced the Novus Ordo. Tridentine theology shaped Catholic seminary training, parish preaching, and devotional life. Vatican I (1870) confirmed Trent and added the definition of papal infallibility. Vatican II (1962 to 1965) revised, completed, or quietly set aside many of Trent's specific provisions (especially on liturgy and ecumenism) while keeping the doctrinal substance. Modern Catholic-Protestant ecumenical dialogue (especially the 1999 Joint Declaration on the Doctrine of Justification between Catholics and Lutherans) has done careful work showing that some Tridentine condemnations targeted Protestant positions that were not actually what the Reformers held, and vice versa, while real doctrinal differences remain.

The Protestant disagreements with Trent are still real. Protestants reject the inclusion of the Deuterocanonical books in the canon, hold sola scriptura against Trent's joint authority of Scripture and Tradition, hold sola fide against Trent's process of justification involving cooperation with grace, deny that the Mass is a sacrifice in any sense that requires propitiation (Trent affirmed it is), and reject most or all of the sacraments beyond baptism and Lord's Supper as sacraments in the proper sense.

In full

The Council of Trent (Concilium Tridentinum, 1545 to 1563) was the 19th ecumenical council of the Catholic Church, convened by Pope Paul III in the city of Trent (then in the Prince-Bishopric of Trent under the Holy Roman Empire, now in northern Italy), held in three discontinuous sessions (1545 to 1547 under Paul III; 1551 to 1552 under Julius III; 1562 to 1563 under Pius IV), and constituting the Catholic Church's official doctrinal and disciplinary response to the Protestant Reformation; it defined Catholic teaching against the Reformers on Scripture and apostolic Tradition as joint sources of revelation, the canon of Scripture including the Deuterocanon, the seven sacraments with transubstantiation reaffirmed, justification as an inner-renewal process involving cooperation with grace rather than purely forensic imputation, original sin and grace doctrine, purgatory, the veneration of saints and relics, and indulgences (reformed in abuse but retained in principle); and it enacted comprehensive disciplinary reform requiring diocesan seminaries, episcopal residence, end of pluralism, the authorization of the Latin Vulgate as the standard text, the Tridentine Mass (Roman Missal, 1570), the Roman Breviary (1568), and the Catechism of the Council of Trent (Roman Catechism, 1566); the Tridentine settlement defined Catholic life through Vatican I (1870, which confirmed and extended it) and largely until Vatican II (1962 to 1965, which revised much of its liturgical and pastoral provision while retaining its doctrinal substance).

Convocation and setting

• Convener: Pope Paul III (Alessandro Farnese, r. 1534 to 1549), who reorganized the papacy along reform lines (appointing reform-minded cardinals, approving the Society of Jesus in 1540, reorganizing the Roman Inquisition in 1542).
• Location: Trent, in the Prince-Bishopric of Trent (modern Trento, Italy). A compromise location: north of the Alps in territory considered politically German (satisfying Emperor Charles V's preference for a council in imperial lands) but south enough to be linguistically and culturally Italian (satisfying Rome).
• Conciliar versus papal authority. Lingering medieval conciliarism had Roman pontiffs worried that any ecumenical council might claim authority over the Pope. Paul III delayed convocation for over a decade after his election and structured the council carefully to keep papal control: legates presided; voting was by individual bishop rather than by nation; decisions required confirmation by the Pope.
• Three sessions:
• First period (1545 to 1547). Under Paul III. Began December 13, 1545. Took up Scripture, original sin, justification, sacraments in general, baptism, confirmation. Moved to Bologna in 1547 over typhus fears and political tensions; effectively suspended.
• Second period (1551 to 1552). Under Julius III. Resumed at Trent. Took up the Eucharist, penance, extreme unction. Protestant observers attended briefly but did not participate. Suspended in April 1552 over the Princes' War (a German Protestant coalition's military success against Charles V).
• Third period (1562 to 1563). Under Pius IV. Took up communion under both kinds (denied to laity), the sacrifice of the Mass, holy orders, matrimony, purgatory, veneration of saints, relics, sacred images, indulgences, the Index of Forbidden Books (assigned to a commission), reform of religious orders, and the disciplinary reform program. Closed December 4, 1563.

Doctrinal definitions

The council's doctrinal decrees, with the most important condemnations of Reformation positions.

Scripture and Tradition (Session 4, 1546)

• Scripture and unwritten apostolic Tradition together constitute the sources of divine revelation. Both are "received and venerated with an equal affection of piety and reverence" (pari pietatis affectu).
• The canon of Scripture is defined to include the 46 books of the Old Testament (Septuagintal canon, including the seven Deuterocanonical books: Tobit, Judith, Wisdom of Solomon, Sirach/Ecclesiasticus, Baruch with Letter of Jeremiah, 1 and 2 Maccabees, plus additions to Esther and Daniel) and the 27 books of the New Testament. Anyone who rejects any of these as canonical is anathematized.
• The Latin Vulgate is declared "authentic" (authentica) for public reading, disputation, preaching, and exposition. (Not declared inerrant in every detail; declared the standard text for Catholic use.)
• Against: Reformers' sola scriptura and rejection of Deuterocanonical books.

Original sin and justification (Sessions 5 to 6, 1546 to 1547)

The decree on justification (Session 6, January 13, 1547) is considered the council's theological masterwork.

• Original sin transmitted by descent from Adam; baptism removes its guilt and restores grace, though concupiscence remains.
• Justification is a process, not a single forensic moment. It begins with prevenient grace (God acts first), continues through cooperation with that grace (free will is engaged and assents), is conferred at baptism, can be increased through cooperation with further grace and the sacraments, can be lost through mortal sin, and can be restored through the sacrament of penance.
• Justification involves inner renewal: the believer is genuinely made righteous, not merely declared righteous while remaining sinful. Sanctifying grace is a real quality infused into the soul.
• Faith is the beginning of justification but not alone: faith working through love (the Catholic reading of Galatians 5:6) is what justifies.
• Merit. Good works performed in grace, by virtue of God's promise, genuinely merit increase of grace and eternal life. (Not condign merit in the strict scholastic sense; merit de condigno under the covenant of grace.)
• Against: Sola fide in the Protestant sense, forensic-only justification, the imputation of Christ's righteousness without inner renewal, the denial of merit.

The Sacraments (Sessions 7, 13, 14, 21 to 24)

• Seven sacraments, all instituted by Christ: baptism, confirmation, Eucharist, penance, extreme unction (anointing of the sick), holy orders, and matrimony. Anyone who denies any of these as a true sacrament is anathematized.
• Sacraments confer the grace they signify ex opere operato (by the work performed) on properly-disposed recipients, not merely by the faith of the recipient.
• Baptism is necessary for salvation; removes original sin and all personal sin.
• Confirmation is a true sacrament distinct from baptism.
• Eucharist (Session 13, 1551). Christ is truly, really, and substantially present under the species of bread and wine. Transubstantiation is the proper term for this change. The whole Christ is contained under each species and in each part of each species.
• Penance (Session 14). A true sacrament for sins committed after baptism. Requires contrition, confession, satisfaction, and priestly absolution. Confession to a priest of all mortal sins (by number and kind, to the best of recollection) is divinely required.
• Extreme unction. A true sacrament for the seriously ill.
• Eucharistic sacrifice (Session 22, 1562). The Mass is a true and proper sacrifice, the same sacrifice as Calvary in its essential reality (the same victim, the same priest, an unbloody mode of offering). Offered for the living and the dead. Communion under both kinds is denied to the laity (this provision was later revised at Vatican II).
• Holy orders (Session 23, 1563). A true sacrament; the priesthood confers an indelible character; ordination requires bishop, who alone can ordain.
• Matrimony (Session 24, 1563). A true sacrament; raises natural marriage to sacramental status; the Tametsi decree required clandestine marriages to be witnessed by parish priest and two witnesses for validity (a major reform of marriage law).
• Against: Reformation reduction of sacraments to two (baptism and Lord's Supper); rejection of ex opere operato; rejection of transubstantiation; rejection of the Mass as sacrifice; rejection of priestly absolution and required confession.

Purgatory, saints, indulgences (Session 25, 1563)

• Purgatory exists; souls there are aided by the prayers of the living and especially by the Eucharistic sacrifice.
• Veneration of saints and relics is legitimate and useful. Saints intercede; their relics may be venerated.
• Sacred images of Christ, Mary, and the saints may be venerated; the honor passes to the prototype they represent. (Drawn from the 7th Ecumenical Council, Nicaea II, 787.)
• Indulgences are retained. The power of granting them was given by Christ to the church. Abuses (especially the financial abuses that triggered Luther's 95 Theses) are condemned and reformed. Indulgences may no longer be sold; they may not be granted in exchange for monetary contributions in a way that suggests transaction.

Disciplinary reform

Often understated relative to the doctrinal decisions but practically transformative.

• Diocesan seminaries (Session 23, 1563). Every bishop must establish a seminary for training priests. The origin of the modern Catholic seminary system. Took decades to implement everywhere; eventually transformed Catholic clergy formation.
• Episcopal residence (multiple sessions, especially 6 and 23). Bishops must reside in their dioceses and personally pastor them. Absentee bishops collecting income from sees they never visited had been a chronic abuse.
• End of pluralism. One man may not hold multiple bishoprics, abbacies, or major benefices.
• Reform of religious orders. Religious orders must observe their rules; abuses are to be corrected; visitation by superiors is required.
• Marriage discipline. Tametsi (Session 24, 1563): for valid marriage, parties must marry before their parish priest and two witnesses. Clandestine marriages, while sacramental if conditions were otherwise met, were declared invalid going forward.
• Standardized liturgy. Pius V issued the Roman Breviary (1568) and Roman Missal (1570) carrying out Trent's mandate. The Tridentine Mass became the standard form of Catholic worship for the next four centuries.
• Catechism of the Council of Trent (1566). Published under Pius V. A teaching resource for parish priests, structured around the Creed, the sacraments, the Decalogue, and the Lord's Prayer.
• Latin Vulgate. Pius V launched, and Sixtus V and Clement VIII completed, the Sixto-Clementine Vulgate (1592), the official Latin text used for over three centuries.
• Index of Forbidden Books. Trent commissioned the project; the first Index Librorum Prohibitorum under conciliar mandate appeared in 1564 under Pius IV. Continued in various editions until suppressed in 1966.

Reception and aftermath

• Catholic states. Adopted Trent's decrees relatively quickly: Italy and Spain immediately, Portugal, Poland, the Spanish Empire, parts of Germany and Eastern Europe over the next several decades. France received Trent's doctrinal decrees but resisted full reception of the disciplinary decrees on Gallican grounds (the Crown wanted to protect royal control over church appointments and revenues).
• Vatican I (1869 to 1870). Reaffirmed Trent and added the dogmatic definition of papal infallibility (Pastor Aeternus, 1870). Confirmed the Tridentine settlement's anti-conciliarist tendency.
• Vatican II (1962 to 1965). Did not repudiate Trent but extensively revised its pastoral, liturgical, and disciplinary provisions:
• Liturgy. Sacrosanctum Concilium (1963) authorized vernacular liturgy; the Novus Ordo Mass (Paul VI, 1969) replaced the Tridentine Mass as the ordinary form of the Roman Rite.
• Communion. Reception under both kinds restored for the laity in many circumstances.
• Ecumenism. Unitatis Redintegratio (1964) embraced ecumenical dialogue with Orthodox and Protestant Christians, modifying the polemical tone of Trent.
• Religious freedom. Dignitatis Humanae (1965) affirmed religious liberty in civil matters, modifying earlier Catholic political teaching.
• Tridentine Mass continuity. Benedict XVI's Summorum Pontificum (2007) widened access to the Tridentine Mass as an "extraordinary form"; Francis's Traditionis Custodes (2021) tightened it again. The ongoing dispute is partly a dispute about how much Vatican II revised Trent.
• Ecumenical re-examination. The Joint Declaration on the Doctrine of Justification (Catholics and Lutherans, 1999; later affirmed by the World Methodist Council, 2006; the Anglican Consultative Council, 2016; and the World Communion of Reformed Churches, 2017) carefully argued that the 16th-century anathemas on justification, on both sides, did not necessarily condemn what the other side actually held. Real differences remain but the dialogue significantly narrowed the disputed territory.

Catholic-Protestant differences after Trent

A summary of where Trent left Catholic doctrine relative to Reformation positions. (Presenting both sides fairly; not adjudicating.)

Long-term significance

• Defined Catholicism. For four centuries, Catholic theology, liturgy, devotion, and discipline were Tridentine.
• Made the Counter-Reformation work. Trent gave the Catholic Reformation its doctrinal and disciplinary backbone.
• Set the line for the Protestant-Catholic divide. The major disagreements have stayed where Trent put them, with edges occasionally softened by ecumenical work.
• Established the modern Catholic clerical system. Seminaries, parish discipline, residence requirements, marriage law, standardized liturgy: all Tridentine.
• Conciliar paradigm. Trent's model (papal convocation, papal confirmation, individual-bishop voting) shaped subsequent Catholic understanding of ecumenical councils. Vatican I (1869 to 1870) and Vatican II (1962 to 1965) operated on the Tridentine pattern, though Vatican II's collegial accent revised it somewhat.

Tensions and contested points

• Conciliarism vs papal supremacy. Trent's structure resolved the conciliarist question pragmatically (papal confirmation required) but did not fully define it. Vatican I (papal infallibility) completed the resolution.
• Justification. Whether Trent and the Reformers were talking past each other (the 1999 Joint Declaration thesis), or whether the real doctrinal disagreement is intact (the Reformed and confessional Lutheran objection to that thesis), remains contested. Both views have serious defenders.
• Deuterocanon. The Reformers excluded the Deuterocanonical books on the basis that the Hebrew canon did not include them and the early church's reception was mixed. Trent's inclusion follows the dominant patristic and medieval Western reception (Augustine, the Council of Hippo 393, Carthage 397, Florence 1442). The honest historical situation has both Hebrew-canon and Septuagintal-canon precedents; this is a contested historical-theological judgment.
• Vatican II's relation to Trent. Whether Vatican II was a development of Trent (continuity reading), a partial reversal of Trent (rupture reading), or a "reform in continuity" (Benedict XVI's preferred formulation), is the central interpretive question of postconciliar Catholicism.
• Vulgate's authority. Trent's declaration of the Vulgate as "authentic" was misread for centuries as inerrant in every detail. Modern Catholic scholarship (Divino Afflante Spiritu 1943, Vatican II's Dei Verbum 1965) clarified that Trent meant the Vulgate is the standard text for Catholic use, not that it is preferable to the original Hebrew and Greek for scholarly purposes.

See also

• Counter-Reformation
• Reformation
• Catholic Church
• Justification by Faith
• Sola Scriptura
• Roman Catholicism
• Vatican I
• Vatican II
• Council of Nicaea
• Church History