The Fortress of San Leucio or Rocca di San Leucio is at the highest point of Veroli and was built in the Middle Ages inside the Polygonal Walls.
The polygonal walls are also known as Cyclopean due to the enormous dimensions of the stone to form the dry walls and were built by the Ernici.
The fortress is therefore one of the foundation points of Veroli.
Above the polygonal walls were then built other walls with boulders of smaller size in the later periods.
The fortress with San Leucio gate dates back to the tenth century and Pope John XIII was imprisoned in its tower in 965.
Pope Alexander III stayed there, fleeing from Rome before the arrival of Federico Barbarossa in 1155.
The fortress and the wall system are they were then destroyed by Ladislao di Durazzo, king of Naples and Hungary in 1406.
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