Johannucci or Di Giovannuccio was his original surname, but then, thanks to his role of primary importance that Andrea Di Giovanuccio assumed in the second half of the 14th century in Terni and in the checkerboard of Italian free townships, next to Johannucci appeared the name "De Castello". Therefore, one of the most illustrious families of Terni's medieval history was born, the Castelli family.
Laying aside the Johannucio part, as a powerful, and then noble family, as well as wealthy, the Castellis built an agglomerate of houses with courtyards near San Lorenzo church, which today is in practice the front part of a tall tower, the Castelli tower, Dionisia tower which preserves only its medieval origins as it was reshaped in the 16th century.
Destroyed by bombs the building next to the Castelli residence, only the buildings on the right side of via De Filis remain, these, too, rehashed and restructured several times, and a structure opposite the tower where stood another tower: only the ruins of the base remain, close to the arch, originally an underpass which served as entrance to the Castelli complex, which as the times suggest, was fortified.
On the other hand, the Castelli family played a role of primary importance in a period of unrest for the city's history, at the dawn of the 15 th century. A family of Ghibellines, on the front line in public debate especially with the most determined and able of its representatives, namely Andrea Castelli who went to war and fought with landlords and soldiers of fortune at the service and on behalf of the Pope. The Castelli family's luck lasted up to 1410 and with theirs that of the Ghibellines who lost primacy with the rescission of the agreement between the two most representative families, the Castellis- to be precise- and the Camporealis. It was, however, Braccio da Montone, a few years later, who determined the end of the Castelli family: the family was physically wiped out. It ended in tragedy, to be sure, but nothing else is known so the subsequent destiny of a family which had reached the height of citizen power remains shrouded in mystery.