Rome

created after the Father, there having been “a time when he was not”)? This seemingly absurd dispute originated in Alexandria, with a highly intellectual priest named Arius (d. 336), who fiercely objected to any prevalent reading of the Scriptures that claimed that Christ was the Son of God, “begotten, not made,” sharing the Father’s divine essence, and existing for all time. Orthodox Christianity disagreed. It regarded the dogma of the Trinity—God consisting of three persons, the Father, Son, and Holy Ghost, who form one substance—as a basic and central tenet of faith, which it was heresy to deny. It was this “one substance” clause, as it were, that generated the passion over whether Christ was homoousios or homousios with his Father. The dogma of the Trinity was a “mystery,” not comprehensible through human logic; there were later attempts to rationalize it, though, as when a Victorian cleric argued that one need only imagine a carriage with three persons riding in it—to which another Victorian cleric retorted that one should try instead to envision three carriages with one single person riding in them.

The dispute was settled, after a fashion, when Constantine himself felt obliged to intervene. In 325, he summoned a council of bishops in the city of Nicaea to pronounce on the ideas of Arius. Their verdict, not unexpectedly, was that Arianism was a heresy to be stamped out. This was enshrined in the Nicene Creed, a document repudiating Arius and agreed to, pro forma, by all the bishops of the Catholic Church. Jesus was now officially homoousios with his father.

Despite Constantine’s gestures toward relative tolerance, by 325 paganism was a lost cause within the Roman Empire. Many of the supporters of Constantine’s erstwhile co-emperor Licinius, still a pagan, were killed off after his death. (Constantine was said to have had Licinius himself strangled, though the circumstances remain murky.) Most of the survivors were dismissed. Pagan rituals, such as sacrifice to the gods, divination, or the consultation of oracles, were now banned absolutely. In effect—and luckily for the archaeology of the future—pagans could keep their shrines, temples, and sacred groves, not demolish them, but not worship in them. Constantine made sure that no more pagans, or even those who had recently abjured pagan beliefs, would be appointed as magistrates, prefects, or provincial governors. All preference would go to Christians. But active persecution of pagan religions was not required, since it might provoke violent counter-reactions. Constantine wanted peace, albeit peace only on terms of submission to Christianity.

Apart from Christianity itself, the great beneficiary of Constantine’s power was the city of Constantinople, which he founded in 330, not quite a quarter-century after he was proclaimed emperor. To say that Constantinople was in any real sense the “new Rome,” replacing the original by a single act of will, is of course a foolish simplification. But Constantine was determined to found a new and great Christian city where he and later Christian emperors could hold their court in an environment not contaminated by physical memories of paganism—no temples to the gods, no relics of pre-Christian institutions. This ruled out rebuilding the site of Troy, which he seems to have briefly considered for its mythological attractions, but then rejected because he did not want his actions attributed to Homeric inspiration.

On Europe’s most southeasterly peninsula, between the saltwater strait known as the Golden Horn and the inlet from the Sea of Marmara called the Bosporus, was a neck of land on which stood the remains of a Greek settlement and the beginnings of a minor Roman city, its origins in the seventh century B.C.E. This city was known as Byzantion. It had obvious strategic and trade advantages. It stood at the intersection of the land route from Europe to Asia and the sea route from the Mediterranean to the Black Sea. It was well placed for self-defense. Most of it was girdled by the waters of the Golden Horn to the north, and the Sea of Marmara to the south. It needed only a wall across its base, between the bodies of water, to make it very difficult to invade. The Via Egnatia linked it to Rome, and from it two other roads led east, toward Asia Minor. The land behind it was indulgent to crops and fruit, and rich in building stone. The sea around it fairly teemed with fish. Aqueducts gave it water, and as soon as serious building work began on the new city, they would be supplanted by many large cisterns, some forty of which survive (and are full of fresh water) to the present day—water palaces, one of which is known to the Turks as “the Cistern of a Thousand and One Columns,” which must be close to a factual description.

Here, a new capital could be built—the capital of what would from now on be the Eastern Empire. It would owe a triple allegiance to geography. It lay at the eastern end of the Mediterranean, between the worlds of Rome and the East, right on the borders of Europe and Asia. Yet it fully shared the character of neither. The Asia Minor to which it partly belonged was neither geographically nor ethno-culturally a part of Asia, though it belonged in a sense to the Asian continent. By the same token, the eastern Balkans, on which Byzantion and its territories abutted, were in most senses remote and disconnected from what an Italian, a German, or a Greek would be inclined to call “Europe.” Byzantion, no matter how or how far it was developed, was almost certain to be an anomaly to both Europeans and Asians. This suited Constantine very well. He threw the resources of his domain into this project, and the resulting metropolis was naturally named after him: Constantinople.

Less is known of the archaeology of Constantinople than of Rome. There are various reasons for this, but the chief one is that, since it was conquered by the Muslims in the early Middle Ages, the Turkish authorities have been at best reluctant, and at worst opposed, to having their city dug up in search of Christian remains, at the possible expense of later, Islamic ones. This deadlock is unlikely to be freed in the imaginable future; it would be too unpopular with today’s radical or even moderate Islam.

The building of Constantinople, spurred by Constantine’s desire for a new capital, went on very fast. In some respects it repeated the layout of Rome, with a central Forum, a Senate House, an Imperial Palace, and a main street, the Mese. Its center was the Hippodrome, where some of the great dramas of the city—political as well as sporting—would be played out after Constantine’s death. It did not, however, have a gladiatorial arena, and its churches took the place of temples. Constantine’s churches were almost always designed on the basilican plan, which produced a huge, long interior space without internal supports, similar to the basilica he had built in Trier when he was still Caesar there. Their ultimate model was the Roman Church of San Giovanni in Laterano, his vast thanks offering for victory at the Milvian Bridge.

Constantine died in 337 C.E. It is likely, though not certain, that despite his colossal achievements he was afflicted by a sense of failure: having killed his eldest son and likely successor, the gifted Crispus, along with his wife, Fausta, he could hardly have felt wholly fulfilled. He had three other sons, all formally recognized as Augusti: Constantine II, twenty-one years old at his father’s death, Constantius II (twenty); and Constans I (fourteen). Deadly quarrels immediately broke out among them. In 340 C.E., Constantine II—who had inherited control of the Western part of the Empire—attacked Constans I, ruler of Italy and Africa. The attack failed, and he was defeated and killed, which placed all the Western Empire (including Britain and Germany) in Constans’ hands, while Constantius II controlled the Eastern part. But Constans’ rule in the West was so harsh that his troops rebelled—an extraordinarily rare event in the Roman army—and in 350 C.E. he was deposed and killed. After much skirmishing, the officers who had led this revolt succumbed to internal bickering and were finally destroyed by Constantius II, who emerged in 353 as the ruler of a united Roman Empire.

After all this murdering and much more maneuvering, Constantius II found himself seeking a co-emperor: the task of running so vast an empire was more than one man could handle. He found a collaborator, as he thought, in Flavius Claudius Julianus (331–63)—Julian the Apostate—nephew of Constantine. As it happened, Constantius had already arranged, in 337, for the murder of Julian’s father and most of his close relatives, sparing Julian (and, for a while, his half-brother, Gallus) only because of their youth. This proved to be a grievous error. Julian had grown up with Gallus, in semi-internment under the thumb of Constantius in the remote provincial village of Macellum, in Cappadocia. Clearly, he was not happy about the massacre of his family (what anguish of survivor guilt did it raise in him?) and he never forgave Constantius for it.

Julian had been raised strictly as a Christian and had even taken lower orders as a lector in the church. His eventual “apostasy,” his turning away from the Christianity