The audioguide tells the story, describes the architecture and reports interesting facts about the basilica of San Lorenzo, outside the walls, one of the oldest basilicas in Rome. According to the legend, Lorenzo was the Archdiocese of Sixtus II, the pope at the time of Emperor Valerian, who rose to the throne in 253 AD. San Lorenzo was executed in 258.The basilica is part of the itinerary of the seven churches made by pilgrims to Rome.The audioguide has been made by professionals in the field of history and art.