This cluster of papers explores the ceremonial, spatial, and authoritative aspects of Rome from Late Antiquity to the Middle Ages, focusing on the transition of power from emperors to popes, the role of Saint Peter's basilica, the influence of patronage and politics, and the representation of Old Saint Peter's basilica. It delves into topics such as the Liber Pontificalis, urban development, and the interplay between liturgy and politics in Old Saint Peter's.