Home to the richest Vatican lapidary collection, it occupies the southern part of the long corridor created to connect the Vatican Palace with the Palazzetto del Belvedere and formerly called Ambulacrum Iulianum from the name of Pope Julius II (1503-1523) or 'Bramante's runner 'from the name of the architect who designed it'. The first nucleus of the collection, organically started by Clement it had been placed, as early as 1772, in the northern part of the ambulatory.