セルウィウス城壁
The territory of the modern "rione" Esquilino, however, has always been regarded as the frontier of the inner city. Initially at the edge of the Servian Wall, whose "agger" was located in the area, during the Imperial age the borough was inserted inside the Aurelian Walls, though remaining marginal in the city context: indeed, according to a probable etymology, the name comes from the Latin word "esquiliae", meaning "suburb".