The excavation inside the Rocca degli Alberti concentrated on two areas of the complex: one inside the standing building (area 1000), the other outside the latter comprising the entire flat summit on which the fortification stands.

In area 1000, inside the large building, the stratigraphy revealed levels and structures relating to four distinct phases.

The excavation uncovered a stratigraphic sequence relating to a period pre-dating the construction of the large building (period I). Only a few of these levels were investigated relating to very organic layers comprising crumbly soil, food remains and plain wares. These levels, all cut by the foundation trenches of the outer walls of the building, were deposited before the latter’s construction and that of the granary which occupies its central space. The pottery places these layers within the 11th-beginning of the 12th century. The interpretation of a third structure situated north of the large building is less certain. Cut by the wall’s foundation, it was constituted by a platform of stones and alignment of stones parallel to the north wall of the large building. On the same alignment as these structures there was a cut which occupied the north corner of the building and within which a pit had been constructed which seems to have been used as a midden.

Contemporarily with the palace (period II) a structure was built inside it, in its central internal space. It was square with a rectangular floor in the centre of which was an aperture, interpretable as the opening to a storage facility for dry goods or water. The floor and the opening showed no signs of wear and the internal walls do not seem to have been faced except for the upper part of the structure which was covered with mortar. The excavation showed that whatever the original function of this feature, in its abandonment phase it was used as a midden for the remains of the meals eaten by those in residence at the time. Materials relating to life in the palace date to the 13th-14th centuries.

The levels of reuse overlying the 14th century stratigraphy were excavated (Period III), which date to the 17th-18th centuries. The collapses of the medieval walls were not found, probably due to the fact that the material was removed over time and reused in the construction of the houses in the “borgo”.

Lastly, several cuts and levelling interventions undertaken on the palace, contemporary with its restoration, date to last century (Period IV).

In the area outside the palace (area 2000), between the latter and the present enclosure wall which divides the “borgo” of Monterotondo from the inner areas of the fortification and the first jump in height, a stretch of wall came to light. This surrounded the upper part of the fortification and was abutted by a series of smaller walls which formed rooms inside the fortification itself. It can be suggested that when the palace in its present form was built, perhaps dating to the 13th century, a perimeter wall surrounding the upper part of the castle was also constructed.