New Rome on the Bosphorus
Constantine I rebuilt the city of Byzantium as a new imperial capital in the early fourth century, and the eastern Roman state that grew around it continued to govern itself as the Roman Empire long after the western provinces had passed to Germanic kingdoms in the fifth century. Its rulers called themselves Roman emperors and its people Romans in Greek; the term Byzantine was applied by later historians rather than used by the empire’s own inhabitants. The state reached its territorial peak under Justinian in the sixth century, when brief reconquests extended its reach across much of Italy and the Mediterranean coastline, and it eventually fell to Ottoman forces with the capture of Constantinople in 1453, ending more than a thousand years of continuous rule from that city.
No agreed start date, and a name it never used
Historians do not agree on a single foundation date for the Byzantine Empire, since it never began as a separate state but continued directly from the late Roman Empire, and different scholars place the meaningful break at Constantine’s founding of Constantinople, at Theodosius’s division of the empire, or at the definitive loss of the western provinces in the fifth century. Some modern historians go further and argue the label Byzantine itself is a later and somewhat prejudicial convenience, since it implies a distinct civilisation where the people involved understood themselves as living in unbroken continuity with ancient Rome. Surviving sources for the empire’s history include imperial chronicles, legal compilations such as Justinian’s law code, and, for its final centuries, eyewitness accounts of sieges and diplomatic exchanges.
Justinian’s peak and the losses that followed
Justinian’s reign in the sixth century combined the codification of Roman law in the Corpus Juris Civilis, the construction of the Hagia Sophia, and a costly series of wars that briefly restored Byzantine rule over Italy and parts of North Africa, straining resources that plague and continuing warfare with Persia further depleted. The seventh century brought catastrophic reversal: the rise of Islam and the resulting Arab conquests stripped the empire of Syria, Egypt and eventually North Africa, removing something on the order of three-quarters of its former revenue base within a few decades. The empire that survived this loss was smaller, more militarised and organised around a defensive provincial system known as the theme, under emperors of the Isaurian dynasty in the eighth century.
Recovery, crusaders, and a slow contraction
A cultural and military revival known as the Macedonian renaissance, running through the ninth to eleventh centuries, culminated in the reign of Basil II, whose long campaign against Bulgaria ended in 1018 and left the empire stretching from the Danube to the Euphrates at his death in 1025. This peak did not last: the Komnenian emperors of the following century restored some regional authority but faced mounting pressure from Seljuk Turks, Normans and the crusading armies passing through Byzantine territory on their way to the Holy Land. The Fourth Crusade’s sack of Constantinople in 1204, carried out by supposedly allied Latin Christian forces rather than by an external enemy, fragmented the empire into rival Greek and Latin successor states; Constantinople was recovered by Byzantine forces in 1261, but the restored empire never regained its earlier strength.
What outlasted the empire itself
Greek gradually displaced Latin as the empire’s language of administration and culture over the centuries following its founding, and Christianity, established as the state religion under Theodosius I in the late fourth century, shaped both its politics and its intense internal religious disputes, including the controversy over the veneration of religious images known as iconoclasm. The empire produced substantial legal and literary works across its long history, and its preservation of classical Greek texts, together with its distinctive religious art and architecture, passed into later Orthodox Christian culture across Eastern Europe and Russia even after Constantinople itself fell to Ottoman forces in 1453, ending what its own subjects had, until the very end, still called the Roman Empire.
A thousand years worth separating from its ending
The Byzantine Empire’s thousand-year span makes it easy to reduce to a single stereotype, either a glittering continuation of Rome or a slow, ornate decline, when the record actually shows repeated cycles of near-collapse and recovery, from the seventh-century territorial catastrophe to the Macedonian renaissance two centuries later. Its own refusal to recognise itself under the name history has given it is a useful reminder that period labels are applied after the fact and often carry judgements the people who lived through the period would not have shared. Readers interested in institutional survival under sustained pressure, in religious controversy shaping politics, or in the direct link between the ancient and medieval Mediterranean will find the length of the empire’s history an asset rather than an obstacle.
