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Everything you need to know about the Church of San Petronio in Bologna


Do you want to know the Basilica of San Petronio? You are in the right place!  Here you can find all you have to know of the Basilica: we will explain you who San Petronio was, where is the Basilica, how to recognise it, its date of construction and much more!

Where is the Basilica?

The Basilica of San Petronio is collocated between the end of St. Ugo Bassi and the beginning of St. Rizzoli in the enormous Piazza Maggiore. It is near various artistic monuments that characterise Bologna, such as the Fountain of Nettuno, the splendid Palazzo Re Enzo, the modern Salaborsa Library, that once was the Botanical Garden of the city!

San Petronio's basil, Basilica Of San Petronio; Piazza Maggiore, Bologna, Bologna centre

Artistical characteristics of the facade

Thanks to its facade of 51 meters of height and 60 meters of width, the Basilica has a dichromatism due to the different styles of decoration used. In fact, the upper section is in tuscan-florentine style, characterised by the dark brown coloration, and the lower section is an esemlification of the white marble gothic style. 

At the base of the Basilica we can find the greater gate, unfinished due to the lack of the pinnacle, decorated with tiles that represents the History of Genesis, a work by Jacopo della Quercia. Instead, on the sides of the main door, we notice two gates of smaller size drawn by Ercole Seccadenari, that represent biblical scenes of the Old and New Testament.

Facade of San Petronio, Basil San Petronio's basil, Basilica Of San Petronio; Piazza Maggiore, Bologna, Bologna centre
Facade of San Petronio, Basil San Petronio's basil, Basilica Of San Petronio; Piazza Maggiore, Bologna, Bologna centre

The Basilica of San Petronio is in the heart of the city. But Bologna’s sotry is interesting also for what concerns its walls, that defended the city for centuries. Discover more about the walls, and appreciate better the city you are visiting! Check our article A Journey to Discover the Walls of Bologna.

Who was San Petronio? 

San Petronio was a prominent figure in the catholic church of the 5th century in Bologna. He was bishop of Bologna for eighteen years, from 431 to 449 A.C.

When we talk about San Petronio, we cannot not consider the testimonies of Eucherio di Lione and Gennadio di Marsiglia. The two were respectively a bishop and a priest that, through their letters and descriptions, allow us to make some biographical considerations about San Petronio.  They explain that San Petronio came from an upper class family. During his adolescence, he decided to separate from this important position and begin his monastic studies. Among time, these lead him to the episcopal dignity, also thanks to the milanese contact with Sant’Ambrogio.

Later, in the 3rd century, the district of Bologna decided to promote San Petronio to patron of the city, replacing San Pietro, who personified the papal values and powers. In the classic iconography, he is represented like an tall, old and erudite man, dressed with the classic cassock suit. Other times he is presented with the city of Bologna in his hands.

San Petronio is also remembered for inventing the “Saint Gerusalem” of Bologna. To know more, read the history of the Seven Church Complex!

Who wanted the Basilica of San Petronio?

The beginning of the construction of the Basilica of San Petronio is dated back to 1390, oerseen by the architect Antonio di Vincenzo. However, we must not forget that, if it wasn’t for the population, probably the church would never be built. In fact, professionists, merchants and artisan burgeois were conquering more and more political recognisation, and so, thanks to the Council of the 7th century, they relaunched the cult of San Petronio.

Not only the basilica: during the 4th century in Bologna rose up numerous buildings between the walls of the city, such as the Basilica of Santa Maria dei Servi, the Loggia della Mercanzia and the Palazzo dei Notai (“Palace of Notaries”). These buildings were used to confer prestige to the city, which was often in competition with Florence and Milan. With the construction of the Basilica of San Petronio, Bologna surpassed these two cities not only for the work but especially because this big Basilica was not built for ecclesiastical will, but rather for civic will.

As soon as you enter into the Basilica, you are attracted by the majesty of the central nave. In the sixth span, there are the greater altar and the ciborium of Vignola. Together with the minor naves, located at the sides, a contrast is created between brick-red and white marble, which donates an soared upward to the structure.

interior of San Petronio's basil, Basilica of San petronio, Bologna, Bologna centre

Inside the left and right naves, we can notice different chapels, precisely eleven for each side. Starting from the right there are: Relics’ Chapel, the one of S. Pietro Martyr, the one of S. Antonio, the one of the Holy, the one of the Immculate, the one of S. Girolamo, the one of S. Lorenzo, the one of the Holy Cross, the one of S. Ambrogio, the one of S. Brigida and the one of the Madonna of Peace.

On the left, instead, there are S. Bernardino’s Chapel, the one of S. Barbara, the one of S. Michele, the one of S. Rocco, the one of S. Giacomo, the one of S. Vincenzo Ferrer, the one of S. Sebastian, the one of the Three Wise Men, the one of S. Ivo’, the one of S. Petronio and the one of S. Abbondio. 

The Bolognini Chapel

We want to point out the Bolognini Chapel, one of the most important: it has frescoes that are attributable to the bolognese artist Jacopo di Paolo. He made works like the Nativity of Christ, the departure of the Three Wise Men, but he is famous for his raffigurations of Paradise and Hell.

interior of San Petronio's basil, Bolognini Chapel, the Bolognini Chapel, Basilica of San petronio, Bologna, Bologna centre

Paradise is characterised by God in the middle, and under him there is Jesus who crowns the Virgin Mary, surrounded by Seraphims, Cherubim, Angels and Archangels.

Hell has in the middle the representation of Lucifer, a two-headed monster, that gulps down and throws up a sinner who represents Giuda the apostle. Around them, there are torture scenes like the one of prophet Maometto. He is taered apart and crumbled from a devil, and this alludes to the retaliation law of Dante, to the schism and to the divisions that were created inside the religious community during centuries.

Inside the Basilica, you can find a bronze statue of San Petronio of 64 cm of height, chiseled by the protagonist of the italian Rinascimento Michelangelo Buonarroti. The Saint is represented as he supports in his hands a copy of Bologna, inside which the Two Towers are easily recognisable, the Garisenda and Asinelli.

Did you know that in the Asinelli tower there is one of the Seven Secrets of the city? To discover more, go check our article A Journey Through the Seven Secrets of Bologna.

interior of San Petronio's basil

The world’s biggest sundial

In its history, the Basilica of San Petronio has had two sundials: one dates back to 1575 and the other to 1657.

The first was created by the mathematician and astronomer teacher Egnazio Danti. He was a dominican monk who was in the commission made by pope Gregorio XIII, born as Ugo Boncompagni, who constructed the Gregorian calendar. 

The sundial had the purpose of marking the variation of the apparent movement of the sun and of defining the movements of the solstice and the equinox during the whole year. This first construction was destroyed by an upgrade of the church in 1653. Then, it was substituted with another more sophisticated sundial made by the astronomer Giovanni Domenico Cassini.

Among the primates of Bologna, there is not just the sundial, but there is also the longest portico in the world. What are you waiting for? Come discover the whole story of the Basilica of the Madonna of San Luca, with its 666 arches, already part of the Unesco World Heritage.

Speaking of primates, we are not finished! In fact, in 2006, the Unesco recognised Bologna as the “Creative City of Music“. Read here about the long tradition and musical culture that characterizes the city!

Giovanni Domenico Cassini and the new sundial for the Basilica

This figure was an italian matematician, astronomer, engineer, doctor and biologist, to hich was dedicated the mission of the spacecraft Cassini, which explored Saturn and Titan. Also, the the astronomical observatory of the University of Bologna is in his honor, and it is located in Loiano.

The University of Bologna has many buildings among the whole city, between old and new palaces: discover the story of the Complex of San Giovanni in Monte, the actual headquarter of the department of History, and Cultures.

He put a gnomic forum on the top of one nave, at the height of 27 metres. Since it had a smaller diameter than the one of the sun, it projected the image of an upside-down sun, like in a darkroom.

Now, it is still possible to admire this process, if you enter the Basilica a few minutes before midday. At this hour, the sunlight enters from the gnomic forum, and, minute after minute, you will see it getting closer to the line of the sundial, up to when it reaches the center. When the light will reach this position, it will be precisely midday, and the sun will be exactly over your head.

sundial, sundial Basilica of San Pretonio, interior of San Petronio's basil, Basilica of San petronio, Bologna, Bologna centre

Speaking of midday: after all this information are not you hungry? Bologna has a wide culinary offer. You cannot miss the fresh hand made pasta of the bolognese sfogline: discover everything about tortellini, tagliatelle and lasagne!

Which is the difference between Basilica, Dome and Cathedral?

People usually generalize these three words by using the term church, but it is not completly correct. Let’s see what they mean.

The Basilica represents the house of the king, of the Lord. Its etymology derives from the greek basileus, that means ‘king’ and from oikos that means ‘house’. Historically the Basilica was used by the Romans as a public building where to manage justice, trade and meetings. However, not all the churches can be considered Basilicas. Which is the difference? It just comes from the artistic and historic value that the Basilica has and has to keep during time. 

The Dome from the latin domus, that means ‘house’, implied of God. The Dome identifies the most important church of the city.  When a city with epicospal base has a Dome, it takes the name Cathedral, that is the most important church of the diocese. It is named as it because the bishop has his desk or throne inside: in Italian it is called cattedra..

So, the main difference between Dome, Cathedral and Basilica consist primarly on its importance. Not only, the buildings have a different architecture , that in some cases is unlike the one of the buildings of the same period. 

If you want to learn the story about the our Cathedral, read the article full of curiosities about San Pietro: the Metropolitan Cathedral of Bologna.

interior of San Petronio's basil, Basilica of San petronio, Bologna, Bologna centre

Do you know that?

The Basilica of San Petronio was the location of important institutional events, beyond being a meeting place for the faithful.

In fact, in 1530 the city became the theatre of the world. The bolognese people brought out their abilities of handcraft and art to celebrate two figures that would write a page of history. These two characters, that stayed at Palazzo d’Accursio, were Carlo V e Pope Clemente VII, borned Giulio Zanobi di Giuliano de’ Medici.

The event concerned the coronation of Carlo V to be emperor of the Holy Roman Empire. It was the Pope who greed to do the cerimony, in order to guarantee a universal peace with the emperor, that would bring to secure defenses for Europe from the turkish invasions. The coronation occurred the 24th February: on Carlo V’s birthday.

For the occasion was erected a jetty which connected the rooms of Palazzo d’Accursio with the ones of the Basilica of San Petronio. Here, the emperor, kneeled in front of the Pope and after pronouncing the ritual formulas, was crowned emperor. 

When can I visit the Basilica of San Petronio?

The Basilica is open everyday from 8.30 a.m. to 1 p.m. and from 3 to 6 p.m.

Not everybody knows that it is also possible to visit the panoramic terrace of San Petronio, in order to enjoy the view of Piazza Maggiore from the top. It is open just on Saturdays and Sundays: in the morning from 10 a.m. to 1 p.m., while in the afternoons from 3 to 5.30 p.m.

The ticket costs 5 euros per person. While the reduced price is 3 euros, and it is available for:

  • people from 10 to 18 years old
  • over 65
  • groups with tour guide

Children under 10 years old and religious people enter for free.

For further information check the website of the Basilica of San Petronio.

Not so far from the Basilica, among the small streets and the colored porticoes, there is the ancient jewish ghetto of Bologna: you cannot miss it!


  • AA.VV., La Basilica di San Petronio I, Bologna, Fondazione Cassa di Risparmio in Bologna, 2003.
  • AA.VV., La Basilica di San Petronio II, Bologna, Fondazione Cassa di Risparmio in Bologna, 2003.
  • Fanti M., Riccomini E., Rubbi P. E., Tassinari O., Le chiese di Bologna, Bologna, L’INCHIOSTROBLU, 1992.
  • Succede solo a Bologna, I segreti di San Petronio, Bologna, Minerva edizioni, 2016.

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