By the beginning of the fourth century Christianity was a growing mystery religion in the cities of the Roman world. It was attracting converts from different social levels. Christian theology and art was enriched through the cultural interaction with the Greco-Roman world. But Christianity would be radically transformed through the actions of a single man.
Rome becomes Christian: Constantine Builds Churches
In 312, the Emperor Constantine defeated his principal rival Maxentius at the Battle of the Milvian Bridge. Accounts of the battle describe how Constantine had seen a sign in the heavens portending his victory. Eusebius, Constantine’s principal biographer, describes the sign as the Chi Rho, the first two letters in the Greek spelling of the name Christos. After that victory Constantine became the principal patron of Christianity. In 313 he issued the Edict of Milan which granted religious toleration. Although Christianity would not become the official religion of Rome until the end of the fourth century, Constantine’s imperial sanction of Christianity transformed its status and nature. Neither imperial Rome or Christianity would be the same after this moment. Rome would become Christian, and Christianity would take on the aura of imperial Rome.
The transformation of Christianity is dramatically evident in a comparison between the architecture of the pre-Constantinian church and that of the Constantinian and post-Constantinian church. During the pre-Constantinian period, there was not much that distinguished the Christian churches from typical domestic architecture. A striking example of this is presented by a Christian community house, from the Syrian town of Dura-Europos. Here a typical home has been adapted to the needs of the congregation. A wall was taken down to combine two rooms: this was undoubtedly the room for services. It is significant that the most elaborate aspect of the house is the room designed as a baptistry. This reflects the importance of the sacrament of Baptism to initiate new members into the mysteries of the faith. Otherwise this building would not stand out from the other houses. This domestic architecture obviously would not meet the needs of Constantine’s architects.
These rooms were often adjoined to create a larger gathering space that could accommodate small crowds of around fifty people. Other rooms were used for different religious and ceremonial purposes, including education, the celebration of the Eucharist, the baptism of Christian converts, the storage of charitable items, and private prayer and mass. The plan of the house church at Dura-Europos illustrates how house churches elsewhere were designed.
The house church in general was known as the domus ecclesiae, Latin for house and assembly. Domi ecclesiae emerged in third-century Rome and are closely tied to the domestic Roman architecture of this period, specifically to the peristyle house in which the rooms were arranged around a central courtyard.
The Basilica
We have already observed the role of the public cults in defining one’s civic identity, and Emperors understood the construction of temples as testament to their pietas, or respect for the customary religious practices and traditions. So it was natural for Constantine to want to construct edifices in honor of Christianity. He built churches in Rome including the Church of St. Peter, he built churches in the Holy Land, most notably the Church of the Nativity in Bethlehem and the Church of the Holy Sepulcher in Jerusalem, and he built churches in his newly-constructed capital of Constantinople.
Emperors for centuries had been responsible for the construction of temples throughout the Roman Empire. We have already observed the role of the public cults in defining one’s civic identity, and Emperors understood the construction of temples as testament to their pietas, or respect for the customary religious practices and traditions. So it was natural for Constantine to want to construct edifices in honor of Christianity. He built churches in Rome including the Church of St. Peter, he built churches in the Holy Land, most notably the Church of the Nativity in Bethlehem and the Church of the Holy Sepulcher in Jerusalem, and he built churches in his newly-constructed capital of Constantinople.
In creating these churches, Constantine and his architects confronted a major challenge: what should be the physical form of the church? Clearly the traditional form of the Roman temple would be inappropriate both from associations with pagan cults but also from the difference in function. Temples served as treasuries and dwellings for the cult; sacrifices occurred on outdoor altars with the temple as a backdrop. This meant that Roman temple architecture was largely an architecture of the exterior. Since Christianity was a mystery religion that demanded initiation to participate in religious practices, Christian architecture put greater emphasis on the interior. The Christian churches needed large interior spaces to house the growing congregations and to mark the clear separation of the faithful from the unfaithful. At the same time, the new Christian churches needed to be visually meaningful. The buildings needed to convey the new authority of Christianity. These factors were instrumental in the formulation during the Constantinian period of an architectural form that would become the core of Christian architecture to our own time: the Christian Basilica.
The basilica was not a new architectural form. The Romans had been building basilicas in their cities and as part of palace complexes for centuries. A particularly lavish one was the so-called Basilica Ulpia constructed as part of the Forum of the Emperor Trajan in the early second century. Basilicas had diverse functions but essentially they served as formal public meeting places. One of the major functions of the basilicas was as a site for law courts. These were housed in an architectural form known as the apse. In the Basilica Ulpia, these semi-circular forms project from either end of the building, but in some cases, the apses would project off of the length of the building. The magistrate who served as the representative of the authority of the Emperor would sit in a formal throne in the apse and issue his judgments. This function gave an aura of political authority to the basilicas.
The Basilica at Trier
Basilicas also served as audience halls as a part of imperial palaces. A well-preserved example is found in the northern German town of Trier. Constantine built a basilica as part of a palace complex in Trier which served as his northern capital. Although a fairly simple architectural form and now stripped of its original interior decoration, the basilica must have been an imposing stage for the emperor. Imagine the emperor dressed in imperial regalia marching up the central axis as he makes his dramatic adventus or entrance along with other members of his court. This space would have humbled an emissary who approached the enthroned emperor seated in the apse.
After Constantine
Following Constantine’s founding of a New Rome at Constantinople, the prominence and importance of the city of Rome diminished. The empire was then divided into east and west. The more prosperous eastern half of the empire continued to thrive, mainly due to its connection to important trade routes, while the western half of the empire fell apart. While Byzantium controlled Italy and the city of Rome at times over the next several centuries, for the most part, the Western Roman Empire, due to being less urban and less prosperous, was difficult to protect. Indeed, the city of Rome was sacked multiple times by invading armies, including the Ostrogoths and Visigoths, over the next century. The multiple sackings of Rome resulted in the raiding of the marble, facades, décor, and columns from the monuments and buildings of the city. Parts of ancient Rome, especially the Republican Forum, returned once again to the cow pastures that they originally were at the time of the city’s founding, as floods from the Tiber washed them over in debris and sediment.
Constantinople
Constantine laid out a new square at the center of old Byzantium, naming it the Augustaeum. The new senate-house was housed in a basilica on the east side. On the south side of the great square was erected the Great Palace of the Emperor with its imposing entrance and its ceremonial suite known as the Palace of Daphne. Nearby was the vast Hippodrome for chariot races, seating over 80,000 spectators, and the famed Baths of Zeuxippus. At the western entrance to the Augustaeum was the Milion, a vaulted monument from which distances were measured across the Eastern Roman Empire.
The Mese, a great street lined with colonnades, led from the Augustaeum. As it descended the First Hill of the city and climbed the Second Hill, it passed the Praetorium or law-court. Then it passed through the oval Forum of Constantine where there was a second Senate house and a high column with a statue of Constantine in the guise of Helios, crowned with a halo of seven rays and looking toward the rising sun. From there the Mese passed on and through the Forum Tauri and then the Forum Bovis, and finally up the Seventh Hill (or Xerolophus) and through to the Golden Gate in the Constantinian Wall.
