The Sforza Castle ( ; ) is a medieval fortification located in
Milan
Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
,
northern Italy
Northern Italy (, , ) is a geographical and cultural region in the northern part of Italy. The Italian National Institute of Statistics defines the region as encompassing the four Northwest Italy, northwestern Regions of Italy, regions of Piedmo ...
. It was built in the 15th century by
Francesco Sforza,
Duke of Milan, on the remnants of a 14th-century fortification. Later renovated and enlarged, in the 16th and 17th centuries it was one of the largest citadels in Europe. Extensively rebuilt by
Luca Beltrami in 1891–1905, it now houses several of the city's museums and art collections.
History
The original construction was ordered by
Galeazzo II Visconti, a local nobleman, in 1358 – 1370; this castle was known as the ''Castello di Porta Giova'' (or ''Porta Zubia''), from the name of a gate in walls located nearby.
It was built in the same area of the ancient Roman fortification of ''Castrum Portae Jovis'', which served as ''
castra pretoria'' when the city was the capital of the
Roman Empire
The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...
. It was enlarged by Galeazzo's successors,
Gian Galeazzo,
Giovanni Maria and
Filippo Maria Visconti
Filippo Maria Visconti (3 September 1392 – 13 August 1447) was the duke of Duchy of Milan, Milan from 1412 to 1447. Reports stated that he was "paranoid", but "shrewd as a ruler." He went to war in the 1420s with Romagna, Republic of Florenc ...
, until it became a square-plan castle with 200 m-long sides, four towers at the corners and up to walls.
The castle was the main residence in the city of its
Visconti lords, and was destroyed by the short-lived
Golden Ambrosian Republic which ousted them in 1447.

In 1450,
Francesco Sforza, once he had shattered the republicans, began reconstruction of the castle to turn it into his princely residence. In 1452 he hired the sculptor and architect
Filarete to design and decorate the central tower, which is still known as the ''Torre del Filarete''. After Francesco's death, the construction was continued by his son
Galeazzo Maria, under the architect Benedetto Ferrini. The decoration was executed by local painters. In 1476, during the regency of
Bona of Savoy, the tower bearing her name was built.
In 1494
Ludovico Sforza
Ludovico Maria Sforza (; 27 July 1452 – 27 May 1508), also known as Ludovico il Moro (; 'the Moor'), and called the "arbiter of Italy" by historian Francesco Guicciardini, became lord of Milan, and called on numerous artists to decorate the castle. These include
Leonardo da Vinci
Leonardo di ser Piero da Vinci (15 April 1452 - 2 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect. While his fame initially rested o ...
(who frescoed several rooms, in collaboration with
Bernardino Zenale and
Bernardino Butinone) and
Bramante, who painted frescoes in the ''Sala del Tesoro''; the ''Sala della Balla'' was decorated with Francesco Sforza's deeds. Around 1498, Leonardo worked on the ceiling of the ''
Sala delle Asse'', painting decorations of vegetable motifs. In the following years, however, the castle was damaged by assaults from Italian, French and German troops; a bastion, known as ''
tenaglia'', was added, perhaps designed by
Cesare Cesariano. In 2025, evidence of tunnels sketched by da Vinci were identified below the structure.

After the French victory in the
Battle of Marignano in 1515, the defeated
Maximilian Sforza, his Swiss mercenaries, as well as the
cardinal
Cardinal or The Cardinal most commonly refers to
* Cardinalidae, a family of North and South American birds
**''Cardinalis'', genus of three species in the family Cardinalidae
***Northern cardinal, ''Cardinalis cardinalis'', the common cardinal of ...
-
bishop of Sion retreated into the castle. However, King
Francis I of France
Francis I (; ; 12 September 1494 – 31 March 1547) was King of France from 1515 until his death in 1547. He was the son of Charles, Count of Angoulême, and Louise of Savoy. He succeeded his first cousin once removed and father-in-law Louis&nbs ...
followed them into Milan, before his
sapper
A sapper, also called a combat engineer, is a combatant or soldier who performs a variety of military engineering duties, such as breaching fortifications, demolitions, bridge-building, laying or clearing minefields, preparing field defenses ...
s placed mines under the castle's foundations, whereupon the defenders capitulated. In 1521, in a period in which it was used as a weapons depot, the ''Torre del Filarete'' exploded. When
Francesco II Sforza returned briefly to power in Milan, he had the fortress restored and enlarged, in addition to a part of it adapted as a residence for his wife,
Christina of Denmark
Christina of Denmark (; November 1521 – 10 December 1590) was a Denmark, Danish princess, the younger surviving daughter of Christian II, King Christian II of Denmark and Norway and Isabella of Austria. By her two marriages, she became List ...
.
Under the Spanish domination which followed, the castle became a
citadel
A citadel is the most fortified area of a town or city. It may be a castle, fortress, or fortified center. The term is a diminutive of ''city'', meaning "little city", because it is a smaller part of the city of which it is the defensive core.
...
, as the governor's seat was moved to the
Ducal Palace (1535). Its garrison varied from 1,000 to 3,000 men, led by a Spanish
castellan
A castellan, or constable, was the governor of a castle in medieval Europe. Its surrounding territory was referred to as the castellany. The word stems from . A castellan was almost always male, but could occasionally be female, as when, in 1 ...
.
In 1550 works began to adapt the castle to modern fortification style, as a hexagonal (originally pentagonal)
star fort
A bastion fort or ''trace italienne'' (a phrase derived from non-standard French, meaning 'Italian outline') is a fortification in a style developed during the early modern period in response to the ascendancy of gunpowder weapons such as c ...
, following the addition of 12 bastions. The external fortifications reached 3 km in length and covered an area of 25.9
hectare
The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), that is, square metres (), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. ...
s.
The castle also remained in use as a fort after the Spaniards were replaced by the Austrians in Lombardy.
Most of the outer fortifications were demolished during the period of Napoleonic rule in Milan under the
Cisalpine Republic
The Cisalpine Republic (; ) was a sister republic or a client state of France in Northern Italy that existed from 1797 to 1799, with a second version until 1802.
Creation
After the Battle of Lodi in May 1796, Napoleon Bonaparte organized two ...
. The semi-circular Piazza Castello was constructed around the city side of the castle, surrounded by a radial street layout of new urban blocks bounded by the Foro Buonaparte. The area on the "country" side of the castle was laid out as a square parade ground known as Piazza d'Armi.
After the
unification of Italy
The unification of Italy ( ), also known as the Risorgimento (; ), was the 19th century Political movement, political and social movement that in 1861 ended in the Proclamation of the Kingdom of Italy, annexation of List of historic states of ...
in the 19th century, the castle was transferred from military use to the city of Milan.
Parco Sempione, one of the largest parks in the city, was created on the former parade grounds.
The government of Milan undertook restoration works, directed by
Luca Beltrami. The
Via Dante was cut through the medieval street layout in the 1880s to provide a direct promenade between the castle and
the Duomo on an axis with the main gate. Between 1900 and 1905 the Torre del Filarete was rebuilt, based on 16th-century drawings, as a monument to King
Umberto I.
Allied
bombardment of Milan in 1943 during
World War II
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
severely damaged the castle. The post-war reconstruction of the building for museum purposes was undertaken by the
BBPR architectural partnership.
Description
The castle has a quadrangular plan, on a site across the city's walls. The wall which once faced the countryside north of Milan has square towers and an ogival gate. This was once accessed through a
drawbridge
A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat. In some forms of English, including American English, the word ''drawbridge'' commonly refers to all types of moveable b ...
. The northern tower is known as the ''Torre della Corte'', and its counterpart to the west is the ''Torre del
Tesoro''; both received wide windows during the
Sforza age.
The corner defended by the ''Torre Ducale'' is characterized by a
loggia bridge, attributed to Bramante, and commissioned by Ludovico Sforza in the late 15th century to connect the ''Corte Ducale'' (the court in the area used as a ducal residence) and the ''Cortile della Ghirlanda''. This ''
ghirlanda'' refers to a wall, protected by a ditch filled with water, built under Francesco Sforza, of which few traces remain today, including the ''Porta del Soccorso''. Remains of two later
ravelins can be seen in correspondence of the point in which the castle was joined by the city walls (near the ''Porta Comasina'' gate) and the ''Porta del Carmine''. The ''Porta della Ghirlanda'' gate was entered through a ravelin (now lost) and had two entrances accessed through runways, which led to an underground passage which continued along the walls.
The external side which once faced the walled city has two round towers, commissioned by Francesco Sforza to replace the former square ones, which had become less suitable to defend against fire weapons. The central tower, called the ''Torre del Filarete'', is a modern reconstruction. The round towers lost their upper parts under the Austrians, who needed open space for their artillery; the towers' present-day upper sections are modern reconstructions. The ''Torre del Filarete'' and the ''Porta del Santo Spirito'', located further to the south, are both preceded by a ravelin.
The main gate leads to a large court from which several internal features can be seen. These include the Tower of Bona of Savoy (1476) and the ''Rocchetta'', a sort of internal defensive
ridotto
Il Ridotto ( Italian : "The Private Room") was a wing of Venice's Palazzo Dandolo near the church of San Moisè. In 1638, it was converted at the behest of Venice's city leaders into a government-owned gambling-house. Il Ridotto was the site o ...
with a gate of its own. At the right of the ''Porta del Carmine'' are the remains of two 15th-century courts. The ''Rocchetta'', whose access gate from the main court (a modern addition) features the Sforza coat of arms, has an internal court with, on three sides, a
portico with 15th-century arcades. The ''Corte Ducale'' is the wing of the castle originally used as a ducal residence; it features a court with two
loggias, a smaller one on the left and a larger one at its end, called ''Loggiato dell'Elefante'' due to the presence of a fresco of an elephant.
Civic museums

The Sforza Castle complex includes the following museums:
* The
Pinacoteca del Castello Sforzesco with an art collection which includes
Andrea Mantegna
Andrea Mantegna (, ; ; September 13, 1506) was an Italian Renaissance painter, a student of Ancient Rome, Roman archeology, and son-in-law of Jacopo Bellini.
Like other artists of the time, Mantegna experimented with Perspective (graphical), pe ...
's ''
Trivulzio Madonna
The ''Trivulzio Madonna'' is a painting by the Italian Renaissance painting, Italian Renaissance painter Andrea Mantegna, executed in 1497. It is housed in the Pinacoteca del Castello Sforzesco, Pinacoteca of the Castello Sforzesco, Milan.
The wo ...
'' and masterpieces by
Canaletto,
Tiepolo,
Vincenzo Foppa,
Titian
Tiziano Vecellio (; 27 August 1576), Latinized as Titianus, hence known in English as Titian ( ), was an Italian Renaissance painter, the most important artist of Renaissance Venetian painting. He was born in Pieve di Cadore, near Belluno.
Ti ...
and
Tintoretto
Jacopo Robusti (late September or early October 1518Bernari and de Vecchi 1970, p. 83.31 May 1594), best known as Tintoretto ( ; , ), was an Italian Renaissance painter of the Venetian school. His contemporaries both admired and criticized th ...
*
The Museum of Ancient Art which includes the armoury, the tapestry room and some funerary monuments
* The
Museum of Musical Instruments
* The
Egyptian Museum
The Museum of Egyptian Antiquities, commonly known as the Egyptian Museum (, Egyptian Arabic: ) (also called the Cairo Museum), located in Cairo, Egypt, houses the largest collection of Ancient Egypt, Egyptian antiquities in the world. It hou ...
* The Prehistoric collections of the
Archaeological Museum of Milan
*
Applied Arts Collection
* The
Antique Furniture & Wooden Sculpture Museum
* The Achille Bertarelli Print Collection. In the same building that formerly housed
Scuola Superiore d'Arte Applicata all'Industria.
* The Museum of the Rondanini Pietà, which includes
Michelangelo
Michelangelo di Lodovico Buonarroti Simoni (6March 147518February 1564), known mononymously as Michelangelo, was an Italian sculptor, painter, architect, and poet of the High Renaissance. Born in the Republic of Florence, his work was inspir ...
's last sculpture (the ''
Rondanini Pietà'')
In 2012, new paintings attributed to
Michelangelo Merisi da Caravaggio were discovered at the castle.
Biblioteca Trivulziana

The Biblioteca Trivulziana is a library of the Municipality of Milan located inside the Sforza Castle, annexed to the Civic Historical Archive. Its holdings include a manuscript by
Leonardo da Vinci
Leonardo di ser Piero da Vinci (15 April 1452 - 2 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect. While his fame initially rested o ...
, the
Codex Trivulzianus.
[Trivulziana Biblioteca trivulziana, and Charles Sotheran. 1888. ''Incunabulic Treasures and Medieval Nuggets from the Trivulzio Library of Milan, Italy Including Vellum Manuscripts of the Thirteenth to the Seventeenth Centuries'', Illuminated ... Part the Second, to Which Are Added from Other Collections Mss. ... Early Printed Books ... Etc. .. New York: G.A. Leavitt & Co.]
Burials
*
Bona of Savoy
See also
*
House of Sforza
*
Sala delle Asse
References
Bibliography
*Costa, Patrizia. “The Sala Delle Asse in the Sforza Castle in Milan.” ProQuest Dissertations & Theses, 2006.
* Palazzo, Michela e Francesca Tasso (edited by), "The Sala delle Asse of the Sforza Castle. Leonardo da Vinci. Diagnostic Testing and Restoration of the Monochrome", Cinisello Balsamo 2017.
*Padovan, Gianluca. ''Castrum Portae Jovis Mediolani : il Castello Visconteo-Sforzesco di Milano dai disegni di Leonardo da Vinci all’archeologica del sottosuolo.'' Oxford: BAR Publishing, 2019. https://doi.org/10.30861/9781407356129.
*Proietti, N, D Capitani, V Di Tullio, R Olmi, S Priori, C Riminesi, A Sansonetti, et al. “MOdihMA at Sforza Castle in Milano: Innovative Techniques for Moisture Detection in Historical Masonry.” In ''Built Heritage: Monitoring Conservation Management'', 187–97. Switzerland: Springer International Publishing AG, 2015. https://doi.org/10.1007/978-3-319-08533-3_16.
External links
*
Panoramic virtual tour outside the castle
Restoration of Sala delle Asse
{{authority control
Archaeological museums in Italy
Art museums and galleries in Lombardy
Buildings and structures in Milan
Castles in Lombardy
Culture in Milan
Decorative arts museums in Italy
Egyptological collections in Italy
*
Museums in Milan
Music museums in Italy
Tourist attractions in Milan
Brick buildings and structures in Italy
Renaissance architecture in Milan
Libraries in Italy
Libraries in Milan