The rocca, probably built around the XIIth century, was conquered in 1492 by Niccolò Fortebraccio and all the documents kept in the archives of the Palazzo di Governo were then burnt.
The excavations have led to the identification of 'filaretto' walls that along two long wings reached down to the village of Villa Basilica surrounding it completely.
Traces of ancient walls can also be seen in a place now called Villa Vecchia, near Barbagliana, where the oldest settlement in the area probably was.