The Byzantine Empire was the eastern continuation of the Roman Empire, surviving the fall of Rome in 476 CE and lasting until 1453 when Constantinople fell to the Ottoman Turks. For nearly a thousand years it preserved Roman law, Greek language and Christian faith in a single imperial state that modern Europeans too often overlook.
What was the Byzantine Empire and where was it?
When historians write about "the fall of Rome" in 476 CE, they mean the fall of the western half — Italy, Gaul, Spain, Britain. The eastern half, centred on Constantinople (modern Istanbul), survived. Its people called themselves Romans (Romaioi) and their state the Roman Empire; historians coined the name "Byzantine" from Byzantium (the old Greek city on which Constantinople was founded) long after it had ceased to exist.
At its greatest extent, under Emperor Justinian I (527–565 CE), the Byzantine Empire controlled the eastern Mediterranean, the Balkans, Anatolia (modern Turkey), Egypt, parts of North Africa and briefly reconquered Italy and parts of Spain. Even after losing these territories, it remained a major power controlling the vital trade routes between Europe and Asia for centuries.
Constantinople itself was an extraordinary city. Protected by the Theodosian Walls — triple walls stretching 6.5 kilometres across the peninsula — it resisted sieges by Persians, Arabs and Bulgars for over a thousand years. At its peak, it was one of the largest and wealthiest cities in the world, with a population that dwarfed any contemporary western European city.
Who was Justinian I and what did he achieve?
Justinian I (527–565 CE) is the Byzantine Emperor who most clearly belongs in KS3 history. Born to a peasant family in the Balkans, he became Emperor in part through the influence of his uncle Justin I, and in part through the partnership of his remarkable wife, Theodora — a former actress who became one of the most politically significant empresses in Byzantine history.
Justinian's achievements were considerable:
- The Corpus Juris Civilis (Body of Civil Law, 529–534): a systematic compilation and codification of Roman law that became the foundation of legal systems across most of Europe. The civil law traditions of France, Germany, Italy and Scotland all trace back to it.
- Reconquest campaigns: General Belisarius led Byzantine forces to recapture North Africa from the Vandals and Italy from the Ostrogoths, temporarily restoring Roman authority in the west.
- The Hagia Sophia (completed 537 CE): an enormous cathedral in Constantinople whose dome appeared to float on light. It remained the largest church in the world for nearly a thousand years and is now a major mosque. Its engineering was centuries ahead of anything in western Europe at the time.
Theodora's role is historically significant in its own right. When the Nika Riots of 532 threatened to topple Justinian, most of his advisers urged flight. Theodora famously declared that purple (the imperial colour) made a good burial shroud — meaning she would rather die as Empress than flee. Her refusal to leave stiffened the court's resolve; the riots were suppressed.
What made Byzantium culturally distinct?
The Byzantine Empire occupied a fascinating historical position: it was Roman in political tradition, Greek in language and culture, and Christian in religion — all three identities blended into something that was none of them exactly.
| Dimension | Byzantine character |
|---|---|
| Language | Greek (Latin was official early, but Greek dominated from the 7th century onwards) |
| Religion | Eastern Orthodox Christianity; the Patriarch of Constantinople rivalled the Pope in Rome |
| Art | Rich tradition of mosaics, icons and illuminated manuscripts, with gold backgrounds and stylised figures |
| Law | Roman legal tradition, preserved and developed through the Justinian codes |
| Architecture | Domed churches, the most famous being the Hagia Sophia |
Byzantine scholarship also preserved classical Greek texts — the works of Aristotle, Plato and the ancient scientists — through periods when they were lost or unknown in western Europe. When Byzantine scholars fled to Italy after the fall of Constantinople in 1453, they brought manuscripts with them. This flow of classical knowledge helped fuel the Italian Renaissance.
Why did the Byzantine Empire decline and fall?
Several overlapping pressures eroded Byzantine power over centuries.
Military pressure from outside was relentless. Arab armies expanding out of the Arabian Peninsula in the seventh century conquered Egypt, Syria and North Africa — permanently. Seljuk Turks defeated a Byzantine army at Manzikert in 1071 and took most of Anatolia (the heartland of Byzantine territory). The Crusades brought western European armies through Byzantine territory, often treating it as an enemy rather than an ally. In 1204, the Fourth Crusade sacked Constantinople itself — western Christians attacking eastern Christians — and established a Latin Empire there for sixty years.
Economic exhaustion and internal political instability compounded external threats. The empire suffered repeated civil wars and dynastic crises that diverted resources from defence.
The Ottoman advance proved decisive. The Ottoman Turks, expanding across Anatolia and into the Balkans from the late thirteenth century onwards, progressively reduced Byzantine territory until by 1450 the empire consisted of little more than Constantinople and a few surrounding areas.
On 29 May 1453, Sultan Mehmed II's forces broke through the Theodosian Walls after a seven-week siege. The last Byzantine Emperor, Constantine XI, reportedly removed his imperial insignia and fought as an ordinary soldier until he was killed. Constantinople became Istanbul, capital of the Ottoman Empire.
Why does the Byzantine Empire matter for KS3 history?
The Byzantine Empire is often absent from British school history, which is a genuine gap. It matters for several reasons a good historical thinker should notice:
First, it complicates the narrative of "the fall of Rome" as a sudden collapse into a Dark Age. Roman civilisation continued, flourishing in the east, for a thousand years after 476 CE — a fact that changes how we understand medieval history.
Second, it was a genuine meeting point of European, Middle Eastern and Central Asian cultures — a civilisation that resists being slotted neatly into "East" or "West".
Third, its fall in 1453 had concrete consequences for European history: it closed overland trade routes to Asia, accelerating the European drive to find sea routes (part of what drove the Age of Exploration), and its scholars' flight to Italy contributed directly to the Renaissance.
Frequently asked questions
Why do we call it the Byzantine Empire if the people called themselves Romans?
The term "Byzantine" was coined by western historians after the empire had ceased to exist, to distinguish the medieval Greek-speaking eastern empire from the ancient Latin-speaking western Roman Empire. The Byzantines never used the word themselves. Using "Byzantine" is useful for clarity, but students should understand it is historians' label — and that those people had a continuous, confident Roman identity that modern terminology obscures.
What was the Hagia Sophia?
The Hagia Sophia ("Holy Wisdom") was a cathedral in Constantinople, completed in 537 CE under Justinian I. Its dome, 55 metres high, appeared to float on a ring of windows in a way that awed contemporaries and baffled engineers for centuries. It was the largest enclosed space in the world at the time of its construction. Converted to a mosque after 1453 and later to a museum, it was reconverted to a mosque again in 2020. It remains one of the greatest works of architecture in human history.
How did the Byzantine Empire influence the modern world?
Byzantine influence flows through several channels. Its preservation of the Justinian law codes provided the foundation for most European civil law systems. Its scholars carried Greek manuscripts to western Europe, fuelling the Renaissance. Its Orthodox Christianity spread to Russia, Ukraine, Serbia and Bulgaria — the Orthodox Church remains a major global institution. The political theology of the Byzantine Emperor (Christ's representative on earth) influenced ideas of sacred kingship across medieval Europe and Russia.
When did the Byzantine Empire actually end?
Conventionally, 1453 — when Constantinople fell to the Ottomans. But this requires nuance. Small Byzantine successor states had existed since the Fourth Crusade's disruption of 1204; the Empire of Trebizond on the Black Sea coast survived until 1461. Some historians argue that Russian Tsars, claiming the title of "Third Rome" as successors to Byzantium, extended Byzantine political traditions until the Russian Revolution of 1917. The "end" of Byzantium is itself a question about how we define continuity and succession in history.
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