Built in the early Middle Ages by the Prefects of Vico to guard the only natural access to the city, in the following centuries it often changed ownership, destination and form. It was owned by the Counts of Anguillara, Della Rovere and Farnese
from 1526 to 1649, under the ownership of the Della Rovere the Castle underwent major changes, in particular between 1475 and 1480 with the restructuring desired by Pope Sixtus IV
and entrusted to the Florentine architect Giovanni Dolci who modified it adding the circular keep and the four fortified towers at the corners, which also gave the castle the current popular name "I Torrioni". Eminent personalities stayed here including Pope Sixtus IV and Pope Paul III. In 1649 it became the property of the Holy See which ceded it in 1756 to the Genoese Girolamo Marè, who undertook to preserve it and embellish it.
Giulia Farnese's apartment is located on the second floor of the Castle, close to the South West bastion where the old 13th century tower stood. The environment, characterized by a fascinating vaulted ceiling and ribs, consists of a living room, a bedroom and a bathroom. In the first room a remarkable sixteenth-century fresco depicting the Risen Christ was found. The location can accommodate 2/3 people.
Margherita Farnese's apartment is located on the second floor of the Castle, near the South East bastion above the Noble Room, where the Chancellery once stood. The accommodation consists of two bedrooms with private bathrooms, a living / dining room and an equipped kitchen. The location can accommodate 4/6 people.
In addition to the apartments, the Castello di Ronciglione can count on different types of equipped and functional rooms, suitable for meetings of 140 people up to small meetings of around 20 people.