Piazza del Plebiscito is a large public square in central Naples, Italy. Named after the plebiscite taken on October 21, 1860, that brought Naples into the unified Kingdom of Italy under the House of Savoy, the piazza is very close to the gulf of Naples and bounded by the Royal Palace and the church of San Francesco di Paola with its hallmark twin colonnades e…Piazza del Plebiscito is a large public square in central Naples, Italy. Named after the plebiscite taken on October 21, 1860, that brought Naples into the unified Kingdom of Italy under the House of Savoy, the piazza is very close to the gulf of Naples and bounded by the Royal Palace and the church of San Francesco di Paola with its hallmark twin colonnades extending to each side. Other noted adjacent buildings include the Palazzo Salerno and, its mirror, the Prefecture Palace.