The Council of Trent was not held in a palace, nor in a purpose-built hall. It was held in two churches standing ten minutes apart on foot, and both can be visited in a single morning.
The first is the cathedral of San Vigilio, in Piazza Duomo, where the Council opened on 13 December 1545 and where it was solemnly closed on 4 December 1563. The second is the basilica of Santa Maria Maggiore, in Piazza di Fiera, which hosted the congregations of the third and final phase.
They are very different buildings, and the difference tells you on its own how long the Council lasted: a Romanesque cathedral begun in the thirteenth century and a Renaissance church put up in four years by a cardinal who wanted to impress Europe.
The practical good news is twofold: entry to both is free, and the cathedral is the only major monument in Trento that never takes a day off.
The cathedral: a building site three centuries long
What makes Trento Cathedral different from any other Romanesque cathedral in northern Italy? The fact that no city built it, a principality did: whoever ruled Trento was bishop and temporal lord at once, and the cathedral is his building of state.
Work took shape in 1212, when prince-bishop Federico Vanga put master Adamo d’Arogno in charge. From there the site ran on for more than a century, carried by generations of stonemasons from Como and the Val d’Intelvi, the Lombard carvers who in those decades were working across half of Europe.
The result can be read on the stone: the portal lunettes, the pilasters and the capitals are a catalogue of architectural sculpture accumulated over time, with differences of hand you notice by comparing two capitals side by side.
The spiral staircases, the first thing you look at
Two open spiral staircases run up the transept front, sheltered under an arcade, climbing along the wall.
They are the most photographed feature of the cathedral and the most misread: they are not ornament, they are service passages leading to the galleries and the upper levels, left in view instead of being buried inside the thickness of the wall. In the seventh bay of the right aisle there is access to another helical stair, the one climbing to the apse galleries.
The reason they stay in the memory is that they break the rule: a Romanesque cathedral normally shows solid surfaces, and here an element of circulation becomes the main decoration.
Beneath the altar: the early Christian basilica of San Vigilio
Under the presbytery, entered from below the high altar, you descend into a second building, and it is the biggest surprise in Piazza Duomo.
What is a whole church doing under the floor of another church? It is there because nobody demolished it: the thirteenth-century cathedral was built on top of what stood there, filling the older level with earth instead of clearing it away, and that is why you can walk inside it today.
This is the early Christian basilica of San Vigilio, the archaeological site of the fourth-century church that stood here before the cathedral, brought to light by excavation and open to visitors. Under your feet lie floors, walls and burials: this is where Trento was already an episcopal see nine centuries before Adamo d’Arogno laid the first stone.
Careful: the underground basilica does not follow the cathedral’s hours. It is run by the Museo Diocesano Tridentino and closes on Tuesdays, a day on which the cathedral above is open as usual. So you can walk into the cathedral and find the floor below shut.
The Chapel of the Crucifix, where the Council signed
On the southern flank of the cathedral opens a Baroque chapel on a square plan with a dome, which clashes with everything around it and has a precise reason to exist.
It was raised between 1682 and 1687 by prince-bishop Francesco Alberti Poja, and it was meant to give a fitting home to one object: the Council Crucifix, carved in wood at the beginning of the sixteenth century by the German sculptor Sixtus Frei. It is the crucifix before which the conciliar decrees were promulgated, and it is why a Romanesque cathedral has a Baroque chapel attached to it.
The sessions of the first and second phases of the Council were held in the choir. On 4 December 1563 the synod was closed here, and the following day two hundred and seventeen council fathers signed the acts at the high altar.
Santa Maria Maggiore, the church of the final phase
Ten minutes on foot to the south, in Piazza di Fiera, stands the other half of the story.
Santa Maria Maggiore was built between 1520 and 1524 at the wish of prince-bishop Bernardo Cles, to a design by Antonio Medaglia, on the remains of a medieval church dedicated to Santa Maria ad Nives. This is the same Cles as the Magno Palazzo at Buonconsiglio Castle, and the coincidence is no accident: these were the years when he was rewriting how the city looked.
From 13 April 1562 the church hosted the congregations of the third and concluding phase of the Council. To do so, a semicircular wooden tribune was erected in the nave and dismantled once the work was over. In 1902 the painter Sigismondo Nardi decorated the vault with scenes of the Council, which is how the nineteenth century chose to remember what had happened here.
The Grandi organ loft, the piece worth the detour
Inside Santa Maria Maggiore is a work that justifies the ten-minute walk on its own: the organ loft, carved by the Vicenza sculptors Vincenzo and Girolamo Grandi.
It is a stone tribune with reliefs and figures, of a virtuosity that surprises in context: this is a church built in a hurry, and the loft is by contrast a very slow piece of carving, the kind you look at from close up to pick out the detail.
Around it stand altarpieces by Giovanni Battista Moroni, Pietro Ricchi, Francesco Unterperger and Giambettino Cignaroli, and the doors of the cathedral organ painted by Giovanni Maria Falconetto in 1508.
The Museo Diocesano, which holds all the keys
Across Piazza Duomo, inside the Palazzo Pretorio, sits the Museo Diocesano Tridentino, and it is worth knowing what is in it before deciding whether to go in.
The museum holds the artistic heritage of the diocese from the eleventh to the nineteenth century: Flemish tapestries, paintings, wooden sculpture, goldwork, and above all the visual record of the Council, that is the images documenting what the sessions looked like. It is where the story of the two churches closes.
Its ticket includes the early Christian basilica, and with a supplement it also covers the climb up the Civic Tower, the 45 metres closing the square on the Palazzo Pretorio side: 156 steps on foot, a one-hour guided visit, ten people at a time, with days and times that change every month.
Practical information
Details checked on 6 September 2026 on the official sites of the cathedral of San Vigilio, the Museo Diocesano Tridentino and the municipality of Trento. Prices and hours change: check again before you travel.
Tickets. The cathedral of San Vigilio and the basilica of Santa Maria Maggiore are free to enter. The early Christian basilica of San Vigilio costs 3 euros full price and 2 reduced if visited on its own, and is included in the ticket of the Museo Diocesano Tridentino, which costs 7 euros full and 5 reduced. The combined ticket with the Civic Tower costs 12 euros full and 10 reduced.
Hours. The cathedral opens every day 6.30-12.00 and 14.30-20.00. Santa Maria Maggiore opens Tuesday to Sunday 9.00-18.00 and closes on Mondays. The Museo Diocesano Tridentino opens 10.00-13.00 and 14.00-18.00 and closes on Tuesdays. The early Christian basilica opens 10.00-12.00 and 14.30-17.30, on Sundays 14.30-17.30 only, and closes on Tuesdays.
Annual closures. The Museo Diocesano and the early Christian basilica close on 1 and 6 January, at Easter, on 26 June for the feast of San Vigilio, on 1 November and on 25 December.
Free entry. At the Museo Diocesano Tridentino entry is free for under-14s, Guest Card Trentino and Museum Pass holders, disabled visitors with their companion, teachers and licensed tour guides.
Getting there. Piazza Duomo is ten minutes on foot from Trento railway station. From Piazza Duomo to Santa Maria Maggiore is a ten-minute walk on the flat, via Via Belenzani or Via Cavour. The cathedral’s main entrance is on via Giuseppe Verdi; the crypt and sacristy have no ramps.
How long it takes. The cathedral asks forty minutes, the early Christian basilica twenty, the Museo Diocesano an hour and a half. Santa Maria Maggiore asks forty. Added up, without the Civic Tower, it is a full morning.
Careful: this visit is made on tiptoe. These are two working churches, not two exhibition halls, and services take precedence over everything.
Two churches and a decree
People who come to Trento for the Council expect a monument and find instead two ordinary churches where people go to mass. That is exactly what makes them interesting: the decisions that changed European painting for a century and a half were taken in a Romanesque choir and under a wooden tribune put up for the occasion.
What was decided, and what effect it actually had on pictures, deserves an article of its own.
Photographs: the cathedral by Jakub Hałun, Santa Maria Maggiore and the Palazzo Pretorio by Falk2, all CC BY-SA 4.0, from Wikimedia Commons.
Read also: The Council of Trent and the art of the Counter-Reformation and What to see in Trento in two days
And if Cles the patron interests you more than Cles the council man, his Magno Palazzo is at Buonconsiglio Castle.
