Council of Trent
The Council of Trent formally opens
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Original prompt & settings (JSON) ↗The first decree came down to a formal question — should the council begin? The assembled fathers answered that it should.
13 December 1545, at Trent
On 13 December 1545 the Council of Trent held its solemn opening session under Pope Paul III, who had authorized it but did not attend in person.
The opening decree formally asked the assembled fathers whether the sacred and general council should begin. They assented, thereby constituting the council in session.
Three papal legates — Giovanni Maria del Monte, Marcello Cervini and Reginald Pole — presided over the first period on Paul III's behalf.
Who was actually in the room
Modern scholarship counts 26 to 30 archbishops and bishops at the solemn opening, along with 5 superior-generals of mendicant orders and 3 Benedictine abbots.
Forty-two theologians were present — more than the bishops.
Attendance totals vary because sources count the categories differently, so a sourced range is safer than a single number.
A ceremony, not a settlement
The opening was predominantly ceremonial and promulgated no doctrinal settlement. Nothing disputed was decided that day.
Trent had been chosen as a compromise location: on the Italian side of the Alps, but politically inside the Holy Roman Empire.
The council fixed its next public session for 7 January 1546, and early deliberations concentrated on procedure.
Sources
- Council of Trent, Session I: Decree Touching the Opening of the Council
- Council of Trent, Session I: Indiction of the Next Session
- The Council of Trent: Doctrine and Reform in Early Modern Catholicism — St Andrews Encyclopaedia of Theology
- Canons and Decrees of the Council of Trent — Hanover Historical Texts Project
Researched 23 Aug 2026 4 sources not yet audited
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What the sources leave uncertain
- The date is fixed by the council's own opening decree.
- Attendance totals vary because sources count categories differently—presiding legates, other cardinals, bishops, abbots, order-generals, theologians, ambassadors, and proxies are not always combined in the same way. A sourced range is therefore preferable to a single total.
Checked against
- Council of Trent, Session I: Decree Touching the Opening of the Council
- Council of Trent, Session I: Indiction of the Next Session
- The Council of Trent: Doctrine and Reform in Early Modern Catholicism—St Andrews Encyclopaedia of Theology
- Canons and Decrees of the Council of Trent—Hanover Historical Texts Project