Siena ( , ; traditionally spelled Sienna in English; ) is a city in Tuscany, in central Italy, and the capital of the province of Siena. It is the twelfth most populated city in the region by number of inhabitants, with a population of 52,991 as of 2025.
The city is historically linked to commercial and banking activities, having been a major banking centre until the 13th and 14th centuries. Siena is also home to the oldest bank in the world, the Monte dei Paschi, which has been operating continuously since . Several significant Mediaeval and Renaissance painters were born and worked in Siena, among them Duccio di Buoninsegna, Ambrogio Lorenzetti, Simone Martini and Sassetta, and influenced the course of Italian and European art. The University of Siena, originally called Studium Senese, was founded in 1240, making it one of the oldest universities in continuous operation in the world.
Siena was an important city in Middle Ages Europe, and its historic centre is a UNESCO World Heritage Site, which contains several buildings from the 13th and 14th centuries. The city is famous for its cuisine, art, Museum, medieval cityscape and the Palio, a horse race held twice a year in Piazza del Campo.
According to local legend, Siena was founded by Senius and Aschius, two sons of Remus and thus nephews of Romulus, after whom Rome was named. Supposedly after their father's murder by Romulus, they fled Rome, taking with them the statue of the she-wolf suckling the infants (Capitoline Wolf), thus appropriating that symbol for the town. Additionally they rode white and black horses, giving rise to the Balzana, or coat of arms of Siena with a white band atop a dark band. Some claim the name Siena derives from Senius. Other etymologies derive the name from the Etruscan family name Saina, the Roman family name Saenii, or the Latin word senex "old" or its derived form seneo "to be old".
The first known document of the Sienese community dates back to 70 AD: the Roman Senate Manlio Patruito reported to Roman Empire that he had been ridiculed with a fake funeral during his official visit to Saena Iulia, a small military colony in Tuscia. The Roman Senate decided to punish the main culprits and to severely call the Sienese to greater respect for Roman authority.
At the end of the third century the city was Christianised by Ansanus, known as the "Baptist of the Sienese", who was punished by the Roman authorities governing Siena with the test of fire and boiling oil, imprisonment and finally beheading. During the Middle Ages he was therefore named patron saint of Siena, and the day of his liturgical anniversary came to mark the beginning of the "Contrada Year".
The Republic of Siena, established in the 12th century, was a vibrant and influential city-state during the medieval and Renaissance periods. Founded on principles of commerce and governance, Siena quickly became a significant player in the region's political landscape. Siena's economy thrived primarily through its wool industry, which was renowned throughout Europe. The city's strategic location along major trade routes further bolstered its prosperity, allowing Siena to establish trade networks that extended across Europe. This economic success was supported by a well-developed banking system and a strong guild structure that regulated various trades and professions.
Politically, the Republic of Siena was governed by a complex system of councils and magistrates, dominated by powerful noble families who competed for influence and control. The city's political structure evolved over time, with periodic reforms aimed at balancing power and maintaining stability. However, internal rivalries often led to factionalism and occasional civil unrest, one of the main challenges faced by many Italian city-states of that period.
Culturally, Siena flourished during the late Middle Ages and Renaissance, producing notable artists such as Duccio di Buoninsegna and Ambrogio Lorenzetti. These artists, along with architects and scholars, contributed to the city's rich artistic and intellectual heritage. Siena's distinctive Gothic architecture, exemplified by the iconic Duomo di Siena and the Palazzo Pubblico, remains a testament to its cultural achievements during this period. In the 1330s Lorenzetti painted the fresco The City at Peace in the local government chamber Sala dei Nove, placing human activities in the foreground while buildings frame and protect the city of Siena.
Despite its cultural and economic prowess, the Republic faced external threats and conflicts, particularly from its rival Florence. The rivalry between Siena and Florence intensified throughout the 14th and 15th centuries, culminating in a series of wars known as the Italian Wars. These conflicts ultimately weakened Siena's political and economic position. From 1547 to 1552, the Spanish-installed governor of Siena was Diego Hurtado de Mendoza, until he was ousted by a Sienese revolt, which re-established the Sienese Republic. In the Italian War of 1551–1559, the republic was defeated by the rival Florence in alliance with the Spanish crown. After 18 months of resistance, Siena surrendered to Spain on 17 April 1555, marking the end of the republic.
The House of Medici, apart from the brief parenthesis of Ferdinando I, who tried to create an organised state, were not able to give a stable structure to the Grand Duchy of Tuscany, keeping almost unchanged the division between the so-called Old State, i.e. Florence, and the New State, i.e. Siena and the southern part up to Pitigliano, with different laws and taxes. With the death of Gian Gastone de' Medici, (1737), who had no children, the Medici dynasty ended and the Grand Duchy passed into the hands of the Habsburg-Lorraine dynasty who kept it until 1799.
In 1966, Siena became the first European city to ban cars from its main square.
The hottest temperature ever recorded was in August 2017. On average, 10 days per year exceed .
In 2009 agricultural activity comprised 919 companies with a total area of for a usable agricultural area of or about of the total municipal area (data ISTAT for the 2000 Agriculture Census V).
There is little manufacturing in the city. One exception is the seasonal confectionery industry, which produces local specialities including panforte, ricciarelli and cavallucci at Christmas, and pane co' santi for All-Saints Day on 1 November and I Morti on the following day.
The area has also seen a growth in biotechnology. The Centenary Institute Sieroterapico Achille Sclavo used to be Swiss-owned, operating under the company name, Novartis Vaccines. Novartis developed and produced vaccines and employed about a thousand people. In 2015, the research plant in Siena became part of Glaxo Smith Kline, as part of a deal between Novartis and this firm.
The Church of San Domenico contains art by Guido da Siena, dating to the mid-13th century. Duccio's Maestà, which was commissioned by the City of Siena in 1308, was instrumental in leading Italian painting away from the hieratic representations of Byzantine art and directing it towards more direct presentations of reality. And his Madonna and Child with Saints polyptych, painted between 1311 and 1318, remains at the city's Pinacoteca Nazionale.
The Pinacoteca also includes several works by Domenico Beccafumi, as well as art by Lorenzo Lotto, Domenico di Bartolo and Fra Bartolomeo.
The Siena Cathedral Pulpit is an octagonal 13th-century masterpiece sculpted by Nicola Pisano with lion pedestals and biblical bas-relief panels. The inlaid marble mosaic floor of the cathedral, designed and laboured on by many artists, is among the most elaborate in Italy. The Sacristy and Piccolomini library have well-preserved Renaissance art frescos by Ghirlandaio and Pinturicchio respectively. Other sculptors active in the church and in the subterranean baptistry are Donatello, Lorenzo Ghiberti, Jacopo della Quercia and others. The Museo dell'Opera del Duomo contains Duccio's famous Maestà (1308–11) and various other works by Sienese masters. More Sienese paintings are to be found in the Pinacoteca, e.g. 13th-century works by Dietisalvi di Speme.
The Piazza del Campo, the shell-shaped town square, unfurls before the Palazzo Pubblico with its tall Torre del Mangia. This is part of the site for the Palio horse race. The Palazzo Pubblico, itself a great work of architecture, houses yet another important art museum. Included within the museum is Ambrogio Lorenzetti's frescoes depicting the Allegory and Effects of Good and Bad Government and also some of the finest frescoes of Simone Martini and Pietro Lorenzetti.
The Palazzo Salimbeni, located in a piazza of the same name, was the original headquarters and remains in possession of the Monte dei Paschi di Siena, one of the oldest banks in continuous existence in Europe.
Housed in the notable Gothic Palazzo Chigi-Saracini on Via di Città is the Accademia Musicale Chigiana, Siena's music school.
Other churches in the city include:
The historic Siena synagogue is also preserved and open to visitors.
The city's gardens include the Orto Botanico dell'Università di Siena, a botanical garden maintained by the University of Siena.
The Medicean Fortress houses the Siena Jazz School, with courses and concerts throughout the year, and a festival during the International Siena Jazz Masterclasses.
In the neighbourhood are numerous patrician villas, some of which are attributed to Baldassarre Peruzzi:
Since 1 November 2021 the public local transport is operated by Autolinee Toscane.
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