Excavation continued to remove the layers of fill (trench 6) in the ditch along the southern slope of the hill. It was ascertained that the ditch was obliterated as a consequence of a single intervention as the material within the layers is, on the whole, homogeneous. The latest material recovered dates to the first twenty-five years of the 15th century. Therefore, it can be assumed that the ditch was filled when the castle was demolished, which according to documentary sources occurred in 1431. Excavation continued on the foundation trench of the outer defensive wall (trench 9), where a cut was found which had been filled in two separate stages, as attested by the very different composition of the fills and materials contained within them. Inside the perimeter walls a cut forming a sort of straight channel in the sandstone natural came to light. It was only partially uncovered, and its function is yet to be defined (trench 8). (Sandro Colussa)