The emergence of a ruin-aesthetic comes after Petrarch, and is initially owed to architects like Brunelleschi and to painters like Raphael. Architects wanted to build in the Roman manner, all’antica, and painters introduced Roman ruins into the background of their pictures. Such was the commitment to the study and imitation of the Roman style that the need to conserve the ruins was recognised and advocated. Hitherto it had never occurred to anyone anywhere to urge that a ruined structure should be preserved for its historical value. But a further value was now attached to the ruins of Rome, namely the aesthetic: the ruins were looked upon as attractive in themselves. The ruins also became the object of study and analysis by a new breed of scholar, the antiquarian and topographer, such as Flavio Biondo, who also wanted to ensure their preservation for future ages to admire. This is a new feature of ruin-mindedness: whatever is deemed beautiful must be preserved for later generations to study and admire and imitate. Since those later generations will include foreign visitors, tourism comes to be recognised as a sound economic reason for conserving the handsome material remains of ancient Rome.

The second chapter accounts for the steady ruination of Rome despite attempts at maintenance of the built environment in late antiquity. Fire, earthquake and flood were the chief agents of destruction. Repairs were always needed but became increasingly rare thanks to depopulation and diminishing public revenue. The shift of secular power to Constantinople and the gradual decay of paganism in the face of buoyant Christianity did the public buildings of Rome, especially the temples and places of entertainment, no favours. Stone from such structures began to be recycled for repairs or for the adornment of new buildings, such as churches. Depopulation emptied large sectors of the city within the Aurelian walls, and the abandoned sites were turned into farms and vineyards.

Despite increasing dilapidation, many of Rome’s ancient buildings survived in a form to impress visitors. During the Middle Ages a number of them – Hildebert of Lavardin, Master Gregorius, Benjamin of Tudela – left a brief record of the favourable impression the ruins made upon them. More widespread, however, were the legendary accounts, as found most extensively in the Mirabilia Urbis Romae, of the history and function of a number of the ruins of the pagan past. Such fables can be seen as forerunners of later ruin-mindedness in their attempt to explain the original role in the urban fabric of what was now ruinous and puzzling.

Chapter 21, “Byzantium in Early Modern Istanbul,” highlights the multiple ways in which the Byzantine past was present in and had a bearing on the lives and imaginations of Istanbulites in the post-Byzantine city within the framework of four topics: rupture and ruin, structures of longue durée, translation and notions of antiquarianism, and, finally, the lives and the reflections of Byzantine monuments and spolia.

The reconstruction of the Constantinian Basilica at the Lateran by Krautheimer and others leaves several important questions unresolved. A combination of evidence corroborates the reconstruction by Krautheimer of the two rows of nave columns of red granite. Two yellow marble columns which since the end of the sixteenth century support the organ tribune however are never mentioned in relation to the reconstruction of the fourth-century church-basilica. In fact they can be traced back to their medieval presence in the portico on the east side of the building. Their similarities with the equally yellow marble columns on the Arch of Constantine support the notion that they belong to the original, early fourth-century structure of the Basilica Constantiniana. The obvious question where they may have been positioned in the Early Christian basilica can be answered by using the archaeological evidence under the basilica. Part of a foundation running west-east underneath the south transept offers a very likely foundation for a colonnade of two yellow columns on both the north and the south side as a continuation of the rows of green marble columns between the inner and the outer aisles.