It is located in Piazza Palazzo, in Castello district. The building dates back to the fourteenth century and it became the seat of the Viceroy since 1337, on orders of Peter IV of Aragon.
Over the centuries, the palace went through several changes, such as the eighteenth-century restorations, including that made by the Piedmontese engineers de Guibert and de Vincenti, who built the main staircase leading to the first floor (“piano nobile”). In 1735, Della Vallea was the author of the restoration works of the first floor (“piano nobile”). The façade overlooking west, with the main gate perfectly aligned to the staircase, was restored in 1769, the same date written in the inscription on the French window's lunette, that opens onto the central balcony.
The royal family, exiled from Turin, which was occupied by Napoleon, settled there from 1799 to 1815. In 1885, the building became the representative seat of the Province, which immediately began the renovation works. The decorative works of the Council Room were committed respectively to Domenico Bruschi from Perugia for the frescoes, and to Angeletti for the stuccoes.