Duomo di Siena

About Duomo di Siena

📜 History

Siena Cathedral had its origins in the late 12th century: in 1196 work began on the site that would house the new episcopal church of the city. The construction of the current building took place between 1220 and 1263, under the direction of the sculptor and architect Giovanni Pisano, who completed the structure based on a previous design. The work was dedicated to Our Lady of the Assumption, a dedication it retains to this day as the seat of the Diocese of Siena. In 1339, civil and ecclesiastical authorities approved an ambitious expansion plan that aimed to triple the area of the temple, transforming the existing nave into a new transept. However, the Black Death epidemic of 1348 decimated the population of Siena and indefinitely halted the works. The walls and pillars of the unfinished project remain visible today on the sides of the building, a testament to that frustrated endeavor. Throughout the following centuries, the interior was enriched with contributions from fundamental artists of Italian art, including Nicola Pisano, Donatello, and Michelangelo, who executed two youthful works for the Piccolomini Altar. The Piccolomini Library, adjacent to the main nave, was added in the late 15th century by order of Pope Pius III to house the collection of his uncle, Pope Pius II.

🏛️ Architecture

The building combines elements of Romanesque in its initial conception with a predominantly Gothic language in its development. The floor plan adopts the shape of a Latin cross with a transept, dome, and bell tower, with a total height of 77 meters. The dome features an octagonal base that becomes circular at the height of the supporting columns; its lantern was added by Gian Lorenzo Bernini during the Baroque period. The exterior is clad with alternating horizontal bands of white and dark green marble, a visual feature that defines the building's identity and also corresponds to the heraldic colors of the city. The main facade incorporates triangular pediments inscribed within squares, oculi, and archivolts of notable geometric precision, and is considered a representative work of Italian Gothic. The bell tower, with Romanesque beginnings, was completed in the 15th century. Inside, the naves display the same rhythm of white and dark marble bands. The pavement is one of the most elaborate elements of the complex: it is composed of religious and allegorical scenes executed in marble inlay technique, with documented participation by Pinturicchio and Domenico Beccafumi. The pulpit, carved by Nicola Pisano and his son Giovanni, is a reference work of late Italian Gothic sculpture, with narrative reliefs of great compositional density.

⭐ Key Facts

The cathedral is the episcopal seat of the Diocese of Siena and is dedicated to the Assumption of the Virgin Mary, a feast celebrated on August 15. Its location in the heart of Siena's historic center, declared a UNESCO World Heritage Site, underscores its status as a cultural and religious reference point for the Tuscany region. The building houses works by some of the most important artists in the history of Italian art: Donatello sculpted an image of Saint John the Baptist for its interior; Michelangelo executed figures for the Piccolomini Altar in his youthful stage; and Gian Lorenzo Bernini left the Baroque sculptures of Saint Mary Magdalene and Saint Jerome. These works make the temple a reference space for understanding Italian artistic development from the 13th to the 17th century. The Piccolomini Library, integrated into the cathedral complex, preserves a decoration by Pinturicchio in which the young Raphael Sanzio participated. The Museo dell'Opera Metropolitana del Duomo, linked to the complex, safeguards the famous Maestà by Duccio di Buoninsegna, a fundamental work of the 14th-century Sienese school, as well as other testimonies of medieval and Renaissance art from the region.

Those who visit Siena find in its cathedral a journey through eight centuries of artistic and religious history. The marble inlay pavement, the Pisano pulpit, the sculptures by Donatello and Bernini, and the Piccolomini Library offer a contemplative experience rarely gathered in a single building. The visit can be complemented with the Museo dell'Opera Metropolitana del Duomo, where Duccio's Maestà is preserved, and with a tour of the walls of the unfinished 14th-century expansion project, still visible on the exterior of the complex.

✍️ Curated by Thomas Anderson · Last updated: 2026-04-05
Information verified by the EncuentraIglesias editorial team