The ornate sandstone arch is set into the western façade of St. Jago's Barracks at the southern end of Main Street, near Southport Gates. The arch is all that remains of the 16th century Spanish Hermitage of Our Lady of the Rosary (). When the British converted the church into military stores, following the 1704 Capture of Gibraltar, the arch was kept and set into the façade of the larger barracks. It was once thought that the arch had been relocated to St. Jago's Barracks from the (Church of Our Lady of the Head) in Villa Vieja (Old Town), within the precinct of the Moorish Castle, but it has since been proven that this was a misunderstanding and that the arch has always been in situ. Anton van den Wyngaerde's depicts the Hermitage of Our Lady of the Rosary at the southern limits of the city walls.