Palazzo d'Arnolfo, Medieval palace in San Giovanni Valdarno, Italy

Palazzo d'Arnolfo is a 13th-century palace in San Giovanni Valdarno, built on a rectangular plan around a main square. Its ground floor has a portico with four arches on the front and six on the sides, resting on octagonal pillars. A tower with two rows of windows and battlements rises from the rear wall, and the upper floor carries two loggias on Renaissance columns.

According to Giorgio Vasari, Arnolfo di Cambio designed the palace as part of Florence's 1300 project for San Giovanni Valdarno, a Terre Nuove town with a rectangular plan and a gate on each side. The building served military and governmental functions as a pretorial seat, was remodelled in the 15th century, and now houses the Museo delle Terre Nuove.

The facade carries over 250 coats of arms of the city's vicariates, the oldest dated 1410 and the most recent 1769. They are worked in stone, glazed polychrome terracotta and fresco, attributed to the Della Robbia family of sculptors. Further coats of arms frescoed on the interior walls record the town's notable families.

A museum inside the palace presents exhibits about urban development in medieval Tuscany through interactive educational displays showing how these towns were planned and built. Visitors can walk through the rooms to understand the region's urban history.

In the atrium of the palace is kept the original Marzocco, a seated lion holding a lily shield on a tall stone pedestal, a symbol of Florentine rule. The portico's octagonal pillars also carry the Florentine lily and the Guelph eagle.