In 1419 the Colonna Pope Martin V confirmed the fief of Bracciano in the Orsini family branch of Tagliacozzo. Under this powerful family the city developed into a flourishing town, famous in the whole of Italy for its castle, which was enlarged, starting from 1470, by Napoleone Orsini and his son Virginio. In 1481 it housed Pope Sixtus IV, who had fled from the plague in Rome; the Sala Papalina in one of the corner towers commemorates the event. Four years later, however, the city and the castle were ravaged by Papal troops under Prospero Colonna, and subsequently a new line of walls was built.
