 The most trusted theory suggests that it might be either the former "Casa del Senato" (House of the Senate), a medieval palace located very close to the Palatine Gate, inside the city walls, or perhaps the "Palazzo di Città" (City Palace), the city hall of Turin placed not far from the gate as well (though a little farther than the old House of the Senate).A second theory hints to the presence of an alleged adjacent amphitheatre built near present-day "Borgo Dora", a historical neighbourhood developing right outside the old city walls (north of the Porta Palatina).This facility might rapidly have fallen into disrepair and, as a result, it might simply have been dubbed "palazzo" by the ancients.