When you exit the Church of St. Peter in Chains you see it immediately, it is there on the right, at the end of the beautiful square. There are some unclear points about the name of this tower. In 1884, as part of the works for the opening of via Cavour, the church of "S. Salvatore" was demolished and the road level was considerably lowered, so much so that it was necessary to build the mighty retaining wall which still today characterizes the church of S.Francesco da Paola, almost suspended at the top with a remarkable scenographic effect. When the convent took over the ancient fortified residence, the 'tower of the Margani', although better known with the suggestive name of "Tower of the Borgias", was raised with a belfry and used as a bell tower. The tower, with a square base, has a brick cladding on all sides with relative reinforcing spurs and dates back to the 12th century, while the crown with travertine corbels dates back to the 15th century. It is practically the same tower, with different names. Interesting.

The tower belonged to the Margani family who in 1305 acquired the house full of ancient remains, including several Ionic columns. They incorporated the remains of an ancient Roman portico in the construction of the tower.