The surrounding walls and the entrance to the area are clearly visible. The clearing that opens immediately after the entrance housed the dwellings of artisans and soldiers. Past another entrance, also fortified, one enters the courtyard from which one enters the Donjon.
The oldest nucleus of the fortification consists of a 12th-century cylindrical tower incorporating earlier defensive structures, and the enclosing wall in which, along the southern side, was the entrance, carved into the limestone bank. Consisting of a cylinder not lacking in momentum despite its 10-meter diameter, the tower is founded on rock and built with the technique of “sack” filling (opus caementicium) within curtains of irregularly shaped limestone ashlars (opus incertum). The walls, which have the thickness of m. 2.50, employ as supports of the facing ashlars, fragments of tiles and roof tiles. The tower is structured on four floors.
In the first one there is a cistern for water supply and a room for the stowage of provisions and timber (storage); the second floor, equipped with single-lancet windows and walled compartments for the storage of objects and the housing of oil lamps, performed kitchen functions, as can be deduced from the presence of the well and the oven-fireplace. Housing functions were intended for the last two floors: the third, equipped with a toilet, a washbasin and a window compartment, was accessible from the outside thanks to the entrance door, placed high up for security reasons, which was reached by means of a wooden structure anchored to the masonry by tie rods. To the right of the door, a staircase carved into the thickness of the wall allowed ascending to the fourth floor, witnessed by a few remains. The roof, used for sighting and defense, also performed the functions of an impluvium for the purpose of water supply; a clay pipe carried water to the cistern, served by the kitchen well.
First built around 850, it was a small fort where a captain and his troop of soldiers took up residence, with the task of guarding the border of the principality of Benevento, which at that point was marked by the Fredane River. When, in 1037, the law on the inheritance of fiefs was instituted, the fief of Rocca San Felice had a lord and the fortress underwent major expansion works and was transformed into a castle. After 1076 with the conquest of these territories by Robert Guiscard, the castle of Rocca San Felice came under the rule of the Normans. In 1147 the fief belonged to Ruggiero di Castellovetere and in 1180 to Elia di Gesualdo. In 1535 the lord of the castle was Annibale Caracciolo, and in 1591 it appears, however, that he ceded it to the Royal family. The last lord of Rocca San Felice was Giovan Francesco Capobianco, who held the fief for a long time and until the eversion of feudality in 1806.