 A 17th-century reliquary ark for the saint was crafted by Lombardian architect Carlo Garavaglia (flourished 1634-1635).The fresco "The Rediscovery of the corpse of Saint Aquilinus of Cologne", by Carlo Urbino, decorates the wall behind the main altar in the Sant'Aquilino chapel.The square facing the basilica features the so-called "Colonne di San Lorenzo" (Columns of St. Lawrence), one of the few remains of the Roman "Mediolanum", dating from the 3rd century AD and probably belonging to the large baths built by the emperor Maximian.