 The basilica, perhaps to avoid the unstable and marshy ground, was built on an artificial hill not far from the walls, along the Via Ticinensis, the main access route to the city, and not far from the Imperial Palace and the amphitheatre, from which were taken some of the materials used in constructing the temple itself.The complex was surrounded by various waterways, coming together to form the Vettabbia, the canal that takes away the waters of Milan, which still flow towards the agricultural areas to the south of the city.The building had a central plan approached by a four-sided portico and surrounded by two connected structures.