 It was not used much until 1674, when the long Portico di San Luca was built from the center of town to the Basilica della Beata Vergine di San Luca, used in yearly procession of an icon.From then on it became also known as the “Porta Sacra” or the “Porta dei pellegrini” (Holy Gate and Gate of Pilgrims) for its placement in the route towards the Sanctuary of San Luca.In 1859, concordant with a rising movement to restore medieval remnants in Italian cities, the architect Giuseppe Mengoli, replaced the mediaeval "cassero" with the present one by connecting it with two crenellated arches to the two lateral cylindrical great towers, giving it its present castle-like form.