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Italy, Rome, St. Peter's Basilica | Rome, San Giovanni in Laterano
Professor Dale Kinney

The first church sponsored by Constantine was the cathedral of Rome, now called San Giovanni in Laterano but originally dedicated to Christ and called "Basilica Constantiniana".



Italy, Rome, S. Giovanni in Laterano, reconstruction


Italy, Rome, San Giovanni in Laterano, Basilica
, Plan


Israel, Jerusalem, Holy Sepulchre, Reconstruction
   
The emperor went on to found major churches throughout the Roman Empire, including a basilica in Jerusalem at the site of Christ's tomb (the Basilica of the Holy Sepulchre), and another on the site of Christ's birth in Bethlehem.

In Rome, the "Book of the Popes" (Liber pontificalis), a sixth-century text based on earlier sources, credits Constantine with the construction of seven basilicas: churches inside the city at the Lateran, where the popes would later have a palace, and in the Sessorian palace, the residence of his mother Helena; and outside the city over the tombs of St. Peter, St. Paul, St. Agnes, St. Lawrence, and Sts. Marcellinus and Peter. These cemetery churches were all on different roads [Map: C, H, D, E, F, G], so that the city was surrounded by large churches memorializing Rome's martyrs and marking its entrances with monumental announcements of the strong Christian presence inside.



Italy, Rome, Map, from R. Krautheimer, Three Christian Capitals
   
   
To illustrate the early Christian basilica I have chosen St. Peter's, which—although it was not the first of Constantine's churches—was by far the most important in the west. Due to the prestige of Peter as the disciple to whom Christ gave "the keys of the kingdom of heaven," as the "rock" (Matthew 16, 13–20) [Reference text pop up below], upon whom Christ founded the church on earth the basilica over Peter's grave was emulated by power-seeking bishops and abbots throughout Europe, especially in the Carolingian period, guaranteeing that the basilica would be the universal type of church architecture in the west. St. Peter's was seen and experienced directly by millions of medieval people, as it was the destination of European pilgrimage for the whole middle ages, and remains so today. When St. Peter's was torn down in the 16th and 17th centuries, its height and length determined the size of the Renaissance basilica that replaced it, and parts of Constantine's basilica survive in the ornament of the present building.

New St. Peter's



taly, Rome, New St. Peter's, Exterior view of the facade


Italy, Rome, New St. Peter's, Interior view of the nave looking east
 
   
Drawings from the Heemskerck sketchbook showing the Vatican during construction of New St. Peter's Basilica on the same site as the Constantinian basilica



Italy, Rome, St. Peter's, Heemskerck drawing (attr.)


Italy, Rome, St. Peter's, Heemskerck drawing (attr.)


taly, Rome, St. Peter's, Heemskerck drawing (attr.)
   
Although the pope's palace was initially on the other side of Rome, at the Lateran, a residence at St. Peter's was established by the sixth century. By the eighth century this second palace in the Vatican was part of a large complex of buildings for guests and pilgrims. In the ninth century it was enclosed by a defensive wall, and became a separate papal "city" (the "Leonine City", after Pope Leo IV (844–855) who built the wall; now Vatican City) distinct from Rome.


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