It is believed that the Rocca di Bonaccorso was erected towards the end of the year 1000 by the founder of the noble Massetana family of Bonaccorsi-Fonzi. It stood on the hill in front of the homonymous spring, and was most likely a fort used to control the roads that converged to the important mountain pass of Water Channel. This is confirmed by a document from 1397 in which Pope Boniface IX granted to the noble of Massa Lello Bonaccorsi the power to levy tolls and duties of all those who passed through the area.