Milan Cathedral

Timeline

1. 1386

   Foundation Stone Laid

   Archbishop Antonio da Saluzzo and the lord Gian Galeazzo Visconti lay the first stone on the site of the fourth-century basilicas of Saint Thecla and Santa Maria Maggiore.

2. 1389

   French Gothic Adopted

   The French engineer Nicolas de Bonaventure is summoned to Milan and shifts the design from Lombard brick Gothic toward the Rayonnant style of northern France.

3. 1418

   High Altar Consecrated

   Pope Martin V consecrates the high altar; liturgical use begins long before the building itself is anywhere near complete.

4. 1488

   Leonardo's Cupola Model

   Leonardo da Vinci submits a wooden model for the central cupola competition; after Bramante's revisions he withdraws, and the Martini scheme is ultimately adopted.

5. 1577

   Borromeo's Consecration

   Archbishop Carlo Borromeo, later canonized as a paradigmatic Counter-Reformation saint, consecrates the cathedral as a whole.

6. 1774

   Madonnina Installed

   The 4.16-meter gilded copper statue of the Virgin is raised on the main spire and quickly becomes the symbolic skyline marker of the city.

7. 1805

   Napoleon's Coronation and Facade

   Napoleon Bonaparte pays out of the French treasury to finish the facade in time for his 26 May coronation as King of Italy.

8. 1813

   Overall Fabric Completed

   After 427 years the principal fabric of the cathedral reaches an interim finish, with later nineteenth-century work refining the spires and glass.

9. August 1943

   Spared in the Milan Bombing

   Allied bombers devastate central Milan but deliberately spare the cathedral as a cultural target; only modest collateral damage is recorded.

10. 1965

    Final Door Installed

    The fifth and final bronze door is installed, formally ending 579 years of original construction on the cathedral fabric.

11. 2017

    Archbishop Delpini Installed

    Mario Delpini becomes the 154th Archbishop of Milan and oversees a heritage program now welcoming roughly seven million annual visitors.

Detailed History

The history of the Duomo di Milano begins in 1386 when Archbishop Antonio da Saluzzo and the lord of Milan Gian Galeazzo Visconti commissioned a new cathedral on the site of the fourth-century Basilica of Saint Thecla and the adjoining Santa Maria Maggiore. Milan was then recovering from the Black Death, and the Visconti dynasty conceived the project as a thank-offering to a depleted population and a public assertion of dynastic authority. The first chief engineer, Simone da Orsenigo, planned a Lombard Gothic brick structure, but in 1389 the French engineer Nicolas de Bonaventure arrived and the design shifted toward the more ambitious Rayonnant Gothic of northern France. Visconti granted the Fabbrica del Duomo exclusive use of the pink-white marble from the Candoglia quarries on Lake Maggiore, shipping it tax-free along the Naviglio Grande and Naviglio della Martesana canals. In 1399 Jean Mignot was summoned from Paris and famously declared the work to date 'sine scienzia' — without science — a critique that drove a generation of Milanese masons to refine their techniques. Construction stalled after Visconti's death in 1402 and resumed only under Francesco Sforza in 1452. In 1488 Leonardo da Vinci entered the competition to design the central cupola, even building a wooden model; after Bramante's revisions Leonardo withdrew, and Francesco di Giorgio Martini's solution ultimately prevailed. The cathedral was solemnly consecrated by Archbishop Carlo Borromeo (later canonized) in 1577, a key act in the Counter-Reformation. Reformation-era interruptions left the facade unfinished for centuries, until Napoleon Bonaparte conquered the city, paid from the French treasury for the front to be finished, and on 26 May 1805 was crowned King of Italy with the Iron Crown of Lombardy. Through the nineteenth century the spires and stained-glass program were completed, and the overall fabric reached an interim finish by 1813. On 13 August 1943, Allied bombers devastated central Milan, but the cathedral was deliberately spared as a cultural target. The wooden doors were replaced with five bronze leaves in the post-war restoration, the last installed in 1965 — formally ending 579 years of construction. Mario Delpini has served as the 154th Archbishop of Milan since 2017, presiding over a building that today welcomes roughly seven million visitors a year.

Cultural Significance

The Duomo di Milano is the seat of the Archdiocese of Milan, the largest Catholic diocese in the world with around five million faithful, and one of the largest active liturgical spaces in Europe. By interior volume it ranks third in the world after St. Peter's and Seville Cathedral, and it is the largest church in the Italian Republic. The 1577 consecration by Archbishop Carlo Borromeo (1538-1584), later canonized as a paradigmatic Counter-Reformation figure, anchors the cathedral firmly in post-Tridentine Catholic history. Napoleon's coronation here on 26 May 1805 as King of Italy made the building a stage of European political history rivaled only by his earlier coronation at Notre-Dame de Paris. From the seventeenth century until 1933, when the Torre Branca rose to 108.6 meters, an informal civic rule held that no Milanese building could exceed the height of the Madonnina — an early example of skyline preservation now studied in heritage urbanism. The Fabbrica del Duomo, founded in 1387 and continuously active for over 630 years, is one of the oldest building organizations on earth. The Candoglia marble itself is significant: an exclusive Visconti grant, the quarry remains in use today, giving the cathedral a unified surface across six centuries. The cathedral has appeared in Visconti's Rocco and His Brothers and Ron Howard's Inferno.

Architectural Details

The Duomo di Milano is a Latin-cross plan church with five aisles — central nave, two side aisles, and two outer aisles — uncommonly broad by French Gothic standards. It measures 158 meters long, 92 meters across the transept, and reaches 108.5 meters at the apex of the Madonnina above the main spire. Fifty-two principal columns rising about 25 meters and exceeding 3.5 meters in diameter march down the interior; instead of foliate capitals their tops carry niches holding statues of saints, a distinctive Lombard solution. The fabric is clad in pale pink Candoglia marble from Lake Maggiore, giving the building a consistent surface across six centuries of construction. The exterior carries 135 white marble pinnacles, each crowned by a statue, contributing to roughly 3,400 sculpted figures across the cathedral. At the highest point stands the Madonnina, a 4.16-meter gilded copper Virgin raised in 1774, which became Milan's symbolic skyline marker until the twentieth century. The central bronze doors completed in 1908 carry reliefs of the life of Mary. The rooftop terraces, accessible by 150 stairs or a paid elevator, let visitors walk among the pinnacles — extremely rare among great cathedrals. Below the floor the fourth-century Battistero Paleocristiano di San Giovanni alle Fonti is preserved, including the well linked to Saint Ambrose's baptism of Saint Augustine.