Palazzo Pubblico

Architecture

The outside of the structure is an example of Italian medieval architecture with Gothic influences. The lower story is stone while the upper crenellated stories are made of brick. At a time when brick as a finished face was rare, Siena preferred it to stone because it was cheaper; this allowed architects to use more expensive detailing elsewhere. The façade of the palace is curved slightly inwards (concave) to reflect the outwards curve (convex) of the Piazza del Campo, Siena's central square, of which the Palace is the focal point. At the top of this façade is a huge round flat bronze plate Christogram, the symbol used by Saint Bernardino. It was placed there by the government in 1425 in gratitude to the great preacher, a native Sienese, for his sermons aimed at quelling social and political factionalism and unrest.

The campanile or bell tower, Torre del Mangia, was built between 1325 and 1344; its crown was designed by the painter Lippo Memmi. The tower was designed to be taller than the tower in neighboring rival Florence; at the time it was the tallest structure in Italy. It was fitted with a mechanical clock during the mid-14th century. Its design has been used as the basis for several other campaniles, including the Dock Tower in Grimsby, England, constructed in 1852 and the Joseph Chamberlain Memorial Clock Tower in the Edgbaston campus of the University of Birmingham, which was completed in 1908.

The upper-story windows of the Palazzo are heavily ornamented trefoil arches, typical of Sienese architecture. The pointed arches of all of the windows are a clear example of Gothic influence.

Frescoes

Nearly every major room in the palace contains frescoes. These were unusual for the time in that they were commissioned by the governing body of the city, rather than by the Church or by a religious fraternity. They are also unusual in that many of them depict secular subjects instead of the religious subjects which are overwhelmingly typical of Italian art of this era. Although these frescoes are secular in origin and overall theme, the ideas are expressed within a religious framework: scriptural verses are quoted on the frescoes.

The most famous of the secular frescoes are three panels in the series on government in the Hall of the Nine (also known as Sala della Pace) by Ambrogio Lorenzetti.

These frescoes are collectively known as The Allegory of Good and Bad Government.

The Allegory of Good Government depicts the personification of Justice as a woman. She gestures to the scales of balance, held by the personification of Wisdom floating over her throne. On the viewer's left, a convicted criminal is beheaded; on the right, figures receive the rewards of justice. At Justice's feet, the personification of Virtue, also, unusually for the time, portrayed as a female figure, passes virtue among 24 faithfully rendered and recognizable images of prominent male citizens of Siena. The men face towards the largest figure in the image, a judge located in the center right. The judge is surrounded by additional personifications including Peace, who is represented as a fashionable, white-clad contemporary female figure with elaborate blonde hair. Concordia joins the cords of peace and welfare that she receives from Justice and gives it to the citizens, who pull this rope together to bind the wrist of Sovereignty. Each personified virtue is titled in its place, so there is no doubt about what each figure represents. The meaning of this fresco is clear: good government will make the people prosper. …