The 2004 campaign revealed a complex stratigraphy in sector 11, situated north of the apse, relating to medieval structures that were subjected to robbing in the Romanesque period. In 2005, below the investigated level, the remains of widely spread productive structures, a circular kiln with brick footing, emerged together with holes containing semi-worked material and baked earth.
In 2004 sector 12, south of the apse, revealed a brick built Roman structure, paved with upside down tiles, that was part of the eastern cloister perimeter, today no longer standing, but attested by the sources until the 18th century. Excavations in 2005 uncovered the structures belonging to the earliest part of the monastic complex, of which traces of robbing remain and to which the excavated floor levels with traces of hearth relate. Inside the walled structures, on the east side, were numerous middens containing material relating to the various phases of the monastery’s life datable to between the 10th-14th century, including a fragment of sculpture.
In 2004 an intervention in the frescoed refectory (sector 16), Sala delle Colonne, identified a stretch of the cloister wall. Excavations in 2005 resolved the question of how the building had been re-founded during the 18th century in order to allow the addition of another storey; moreover, the strategraphic sequences, consisting of pavement makeups relating to the period between the 10th-14th century were investigated. These levels relate to at least three overlying building phases, the last remaining in use until the end of the 14th century.
A new trench was dug in Piazza Liberazione adjacent to the sector where a large late medieval cemetery belonging to the church of S. Lorenzo, was identified in the centre of the piazza (sector 10). The new sector revealed a new building 15 m long, part of a religious structure, with traces of a brick pavement that had been removed. (MiBAC)