In the tenth century the Subiaco Abbey built a castle in Ciciliano with four towers for observation and defence of the Giovenzano Valley, an alternative route to Rome from the East. In the sixteenth century the castle became the property of the family of Theodoli, Bishop of Cadiz. The fifteenth-century castle is a classic square building with four corner towers. The kitchens and a roof garden overlook the courtyard. The castle is complete with dungeons and the cylindrical tower that was added a century later.