The creation of a basement room as part of the modernisation of the building housing the Casa Vinicola Pio Cesare was preceded by excavations to investigate an area coinciding with one of the triangular shaped _insulae_ situated in correspondence with the four oblique sides of the octagonal plan of Roman _Alba Pompeia_. In fact, the foundations of the modern building rest directly on the Roman town wall, of which the external face was visible, the intention of the investigation being to expose the inner face. The excavation of the courtyard to a depth of about 4.80 m cut a deposit of rubble levels abutting the inner face of the wall. These dumps were partially cut by a modern sewer trench. They contained a large quantity of pottery datable to the 18th-19th century and 15th-17th century. The same trench had almost completely destroyed a wall, uncovered in the eastern sector, perpendicular to the town wall which it abutted. The wall related to a 13th century settlement phase overlying the earlier dumping on the natural clay in which the foundations of the town wall were cut, exposed to a height of 4.50 m, 12.80 m in length and 2.40 m wide, and already robbed of the cobblestone and brick facing before the 15th century. The foundations, between 1.40 m and 1.65 m deep, were trench-built in cobbles, occasional brick/tile and abundant mortar. On top of this footing, where visible, was a first brick course and on top of this a cobble course followed by a double course of brick/tile marking the offset up to2.75 m below ground level. From this point only the cornices of the inner stringcourse were preserved, as they had been completely removed from the structure’s exterior.