Bishop's townhouses were always "palazzi", and the seat of a localized regime would also be so called. Many former capitals display a Ducal Palace, the seat of the local duke or lord. In Florence (just as for other strong communal governments), the seat of government was known as Palazzo della Signoria. When the Medici were made Grand Dukes of Tuscany, however, the centre of power shifted to their new residence in Palazzo Pitti, and the old centre of power began to be referred to as the Palazzo Vecchio.