The Old Fortress of Livorno is a castle in Livorno, Italy. The Old Fortress is a successor building to a medieval fort built by the city of Pisa in the location of an older keep built by Countess Matilda of Tuscany in the 11th century. The 11th-century tower was incorporated inside the fort built by the Pisans. The castle has been described as a "symbol of Medicean Livorno". The fort is located at the Medicean Darsena, or old dock of the port of Livorno, built by the Medici family. The ceremony proclaiming Livorno a city took place inside the fortress on 19 March 1606.