The theater-stadium in Thessaioniki is a significant, unexpected find. Besides its religious significance — it is related to the martyrdom of St. Demetrius, patron saint of the city— and the historic topography that have been approached, new questions have been raised regarding the city-planning axis and the identification of other disputable buildings of Thessaioniki . Besides its importance as a unique building in Northern Greece and a place where ancient Greeks congregated during the Roman period, the discovery of the theater-stadium is a break through where the established historic topography of the city is concerned and redefines the factors for identifying more buildings which either have already been excavated in Thessaioniki or will be in the future.