The Palazzo Comunale dates from the late 13th century, and was built on the ruins of an existing building between 1289 and 1298.[3] Further expanded in the 14th century,[4] the facade is characterised by arched windows, with the lower half of the frontage built with stone, and the upper part in brick.
On the ground floor is a courtyard, which was built in 1323[5] and is decorated with the coats of arms of those who have held public office in the municipality.[3] The main civic offices of the town council are now located on this ground floor.[6]
On the first floor is a stepped gallery from which dignitaries would address the gathered crowd in the square. The battlements date from a restoration of the nineteenth century,[4] and the structure is capped by the "Torre Grossa” (great tower). This tower was completed in 1300[6] and (at 54 meters) is the highest tower in the walled town.[3]
Museum
The Palazzo Comunale, seat of the government of San Gimignano, was built in 1288. Enlarged in 1323, the palace became the seat of the town after it had taken place in the nearby Palazzo Vecchio del Podestà, from 1337. The building houses the civic museum since 1852. The crenellated crown and other elements date back to the restoration carried out by Giuseppe Partini between 1878 and 1881.
The Civic Museum of San Gimignano is located on the upper floors of the building and can be accessed both from the Piazza del Duomo and from the courtyard behind the Palace. The courtyard was built in 1323 and is decorated with frescoes or sculpted coats of arms and, in the center, a cistern arranged in 1361. Among the frescoes is a Sant'Ivo that makes justice of Sodom, a Madonna with two saints by an unidentified Sienese painter of the second half of the fourteenth century, and a Justice that tramples on the lie monochrome of Vincenzo Tamagni (sixteenth century). From here starts the external staircase for the entrance to the premises of the museum, covered by a canopy supported by brick columns.[7]
Hall
The "Sala del Consiglio" is a large reception hall which was used as the council chamber.[3] It is commonly known as the "Sala di Dante" and is named for the noted poet Dante Alighieri who visited San Gimignano in 1300 as an ambassador of the Florentine Republic.[8] He pleaded before the mayor and the general council the cause of a Tuscan Guelph league.[7]
The room is decorated with a Maestà by Lippo Memmi. Commissioned in 1317 by Nello de Mino Tolomei (then podestà of San Gimignano), the fresco is believed to have been inspired by the one painted by his brother-in-law Simone Martini's Maestà from the Palazzo Pubblico in Siena.[9] The fresco shows Mary seated on a throne surrounded by adoring saints and angels (including patron Nello de Mino Tolomei).[9]
Just off the great hall is a meeting room which was originally used for private meetings.
The next room was used by the city government. It contains the ancient carved and inlaid wooden seats (1475) and a bust of San Bartolo in coloured terracotta of the first half of the fifteenth century within a niche. On this floor, there is another small room with a bust of Guido Marabottini, in Florentine terracotta of the fifteenth century. From here also starts the staircase for the climb to the Torre Grossa. The actual art gallery is located on the second floor.[7]
The Podestà apartments (Camera del Podestà) are frescoed with matrimonial scenes of a couple taking a bath and going to bed. (An unusual work by Memmo di Filippuccio dated to the early 14th century.)[6]