In the heart of S. Maria Capua Vetere, in an already partially built up area, the demolition of a building dating to the early 1900s, revealed the opus latericium structures of the western part of an imposing Imperial Roman architectural complex. This comprised a rectangular aula on a north-south alignment (9.60 m long), north of which was a large apsidal room of similar size (9.70 m long), with walls that were originally faced with marble slabs. The building, which obliterated earlier structures in opus quasi reticulatum, underwent numerous alterations until the late antique period, attested by the stratification of at least three floors in the rectangular aula. The building’s dimensions suggest that it was for public use.