The Byzantine Empire
The Roman Empire that outlived Rome by a thousand years — from Constantine's New Rome to the fall of Constantinople, every milestone sourced.
A timeline of the Byzantine Empire, the Greek-speaking Christian continuation of the Roman Empire in the East, from the founding of Constantinople in 330 to the fall of the last Byzantine remnant at Trebizond in 1461. It runs through the golden age of Justinian and Theodora — the reconquests of Belisarius, the great code of Roman law, the Hagia Sophia, and the plague — the struggle to survive the rise of Islam behind Greek fire and the great walls, the iconoclasm controversy, the medieval peak under Basil II, the conversion of the Slavs and the Rus, the Great Schism, the disaster of Manzikert, the Komnenian revival, the catastrophe of the Fourth Crusade, and the long decline to the Ottoman conquest. Every event is backed by a dedicated, content-verified source.
Events
- 330 CEReputable sourceWell documented
The Founding of Constantinople
In 330 CE the Roman emperor Constantine the Great dedicated a magnificent new capital on the site of the old Greek city of Byzantium, at the strategic crossing between Europe and Asia. He called it 'New Rome,' but it became known as Constantinople — the city of Constantine. Christian from its foundation, it was built to be the greatest city in the world.
Why it matters: Constantinople would be the capital of the Roman and then Byzantine Empire for over a thousand years — the richest, largest, and best-defended city in Christendom, and the bridge between antiquity and the medieval world.
Sources- World History Encyclopedia. Constantinople · reference
Related timelines- Ancient Rome → — The 'New Rome' of the later Roman Empire
- 476 CEReputable sourceWell documented
The Survival of the Roman East
When the Germanic commander Odoacer deposed the last Western emperor in 476 CE and the Western Roman Empire dissolved into barbarian kingdoms, the wealthier, more urbanized eastern half survived intact. Ruled from Constantinople, it carried on as the Roman Empire — Greek-speaking and Christian, but proudly Roman. Historians call it the Byzantine Empire; its people simply called themselves Romans.
Why it matters: The Eastern Roman Empire's survival meant that Roman law, learning, and statehood endured for another thousand years after Rome itself fell — a continuity that preserved much of classical civilization through the Middle Ages.
SourcesRelated timelines- Ancient Rome → — The fall of the West and survival of the East
- 527–565 CEReputable sourceWell documented
Justinian I and the Dream of Rome Restored
The emperor Justinian I came to the throne in 527 determined to restore the Roman Empire to its ancient glory. In a reign of nearly forty years he launched wars to reconquer the lost West, rebuilt Constantinople in splendour, and reformed the empire's law and administration — the last great flourishing of the ancient Roman world.
Why it matters: Justinian's ambition briefly made the Mediterranean a Roman lake again and left monuments of law and architecture that outlasted the empire itself. But his wars and a catastrophic plague overstretched the state, and much of what he won was soon lost.
Sources- World History Encyclopedia. Justinian I · reference
- 527–548 CEReputable sourceWell documented
Theodora and the Nika Riots
Justinian's wife Theodora, a former actress of humble birth, became one of the most powerful empresses in history. In 532, when the Nika Riots — sparked by the chariot-racing factions of the Hippodrome — engulfed Constantinople and nearly toppled Justinian, he prepared to flee. Theodora is said to have shamed him into staying with the words that royal purple made a fine burial shroud. The revolt was crushed, with tens of thousands killed, and Justinian's throne was secured.
Why it matters: Theodora's nerve during the Nika Riots saved Justinian's reign at its most vulnerable moment. She wielded real political power, influenced law and religious policy, and remains one of the most remarkable figures of the age.
Sources- World History Encyclopedia. Theodora · reference
- 533–554 CEReputable sourceWell documented
Belisarius and the Reconquest
Justinian's brilliant general Belisarius carried out the emperor's dream of reconquest. In 533–534 he destroyed the Vandal kingdom of North Africa, and from 535 he led the long, grinding Gothic War to retake Italy, capturing Rome and Ravenna. Byzantine armies also won a foothold in southern Spain.
Why it matters: Belisarius restored much of the old Western empire to Roman rule, if only briefly, and ranks among the greatest generals of late antiquity. But the wars devastated Italy and drained the treasury, and the gains proved impossible to hold.
Sources- World History Encyclopedia. Belisarius · reference
- 529–534 CEReputable sourceWell documented
The Code of Justinian
Justinian ordered a team of jurists led by Tribonian to gather a thousand years of tangled Roman law into a single, coherent body of work — the Corpus Juris Civilis. It comprised the Codex of imperial laws, the Digest distilling the writings of the great Roman jurists, the Institutes as a textbook for students, and later new laws called the Novellae. Rediscovered in medieval Italy, it was studied at Bologna and spread across Europe.
Why it matters: The Corpus Juris Civilis preserved Roman law and carried it into the future. It became the foundation of the civil-law tradition that governs much of Europe, Latin America, and beyond today — arguably the most influential legal work in history and Byzantium's most enduring gift to the world.
Sources- World History Encyclopedia. Corpus Juris Civilis · reference
Related timelines- History of Democracy → — The Roman legal legacy in modern law
- 537 CEReputable sourceWell documented
The Hagia Sophia
After the old cathedral was burned in the Nika Riots, Justinian rebuilt it on a scale never seen before. Completed in 537, the Hagia Sophia (Holy Wisdom) was crowned by an enormous dome that seemed to float on light. On entering it, the emperor is said to have exclaimed, 'Solomon, I have outdone you.' For nearly a thousand years it was the largest enclosed space in the world.
Why it matters: The Hagia Sophia was the supreme masterpiece of Byzantine architecture and the greatest church in Christendom, its floating dome a triumph of engineering that awed visitors for centuries and influenced architecture from mosques to cathedrals.
Sources- World History Encyclopedia. Hagia Sophia · reference
Related timelines- History of Architecture → — One of the greatest domes ever built
- 541–549 CEReputable sourceWell documented
The Plague of Justinian
At the height of Justinian's reign, the first recorded outbreak of bubonic plague erupted in the empire. Spreading along trade routes from Egypt, it reached Constantinople in 542, killing enormous numbers — the emperor himself caught it but survived. The pandemic recurred for two centuries and may have killed tens of millions around the Mediterranean.
Why it matters: The plague shattered Justinian's hopes of a lasting restoration of Rome, gutting the empire's population, armies, and tax base at the worst possible moment. It reshaped the late-antique world and helped end the age of ancient empires.
SourcesRelated timelines- Pandemics Through History → — The first great bubonic plague pandemic
- c. 550 CEReputable sourceWell documented
Procopius and the Secret History
Procopius of Caesarea, who served on Belisarius's staff, became the great historian of Justinian's age. His official Wars and Buildings chronicled the emperor's campaigns and monuments — but in a scandalous private work, the Secret History, he savaged Justinian and Theodora as corrupt and even demonic. It was not published until long after his death.
Why it matters: Procopius is the single most important source for the sixth-century empire, and the Secret History is one of the most extraordinary documents to survive from antiquity — a reminder that even a golden age looked very different from below.
Sources- World History Encyclopedia. Procopius · reference
- 610–641 CEReputable sourceWell documented
Heraclius and the Last Great War of Antiquity
Heraclius seized the throne in 610 to find the empire on the brink of collapse, its eastern provinces overrun by the Sasanian Persians, who had even carried off the True Cross from Jerusalem. Against the odds he reorganized the state and, in a daring counteroffensive, crushed Persia at the Battle of Nineveh in 627. He recovered the lost provinces and the True Cross — but the two exhausted empires were left defenceless.
Why it matters: Heraclius's victory ended the centuries-long Roman–Persian rivalry, the 'last great war of antiquity.' But it was a hollow triumph: within a decade the new armies of Islam would sweep away Persia entirely and tear the same provinces from Byzantium.
Sources- World History Encyclopedia. Heraclius · reference
- 634–642 CEReputable sourceWell documented
The Arab Conquests and the Loss of the East
In the 630s the armies of the new Islamic caliphate exploded out of Arabia. At the Battle of Yarmouk in 636 they annihilated a Byzantine army, and the empire abandoned Syria; Jerusalem fell in 637 and Egypt by 642. The empire's richest and most populous provinces — the granary of Egypt and the wealth of the Levant — were gone forever.
Why it matters: The Arab conquests permanently shrank the Byzantine Empire, stripping away perhaps three-quarters of its revenue and transforming it from a Mediterranean superpower into a medieval Greek Christian state fighting for survival against the Islamic world.
Sources - 674–718 CEReputable sourceWell documented
The Arab Sieges and Greek Fire
Twice the Arab armies laid siege to Constantinople itself — in 674–678 and again in 717–718 — and twice the city held. Its salvation lay in two great defences: the massive triple Theodosian Walls, the strongest fortifications of the medieval world, and 'Greek fire,' a secret incendiary weapon sprayed from siphons that burned even on water and terrified enemy fleets. Its exact recipe was so closely guarded that it is lost to this day.
Why it matters: The failed Arab sieges were among the most decisive events in European history: had Constantinople fallen, the Islamic advance into Europe might have come seven centuries before the Ottomans. Greek fire and the great walls let a shrunken empire survive for another 700 years.
Sources- World History Encyclopedia. Greek Fire · reference
- 726–843 CEReputable sourceWell documented
The Iconoclasm Controversy
For over a century the empire was torn by a bitter dispute over religious images, or icons. Beginning with Emperor Leo III around 726, iconoclast emperors who believed icons were idolatrous ordered them destroyed, while their opponents venerated them. The conflict convulsed church and state until the veneration of icons was finally and permanently restored in 843, an event still celebrated as the 'Triumph of Orthodoxy.'
Why it matters: The iconoclasm controversy shaped Orthodox Christianity's distinctive theology of the icon and revealed the deep entanglement of religion and imperial politics in Byzantium — a defining feature of the empire.
Sources- World History Encyclopedia. Byzantine Icons · reference
- 4th–11th centuriesReputable sourceWell documented
The Gold Solidus: Byzantium's Coin
Introduced by Constantine in the early 4th century, the Byzantine gold coin — the solidus or nomisma — held its weight and purity almost unchanged for some 700 years. Trusted from western Europe to India, it functioned as the medieval world's dollar: the standard against which other currencies were measured. Only in the 11th century was it debased, before Alexios I Komnenos replaced it in 1092.
Why it matters: The rock-solid solidus underpinned Byzantine wealth and diplomacy for centuries, letting the empire pay armies, buy off enemies, and dominate Mediterranean trade. Its long stability is one of the great achievements of pre-modern economic history.
Sources- World History Encyclopedia. Byzantine Coinage · reference
Related timelines- History of Money → — The medieval world's most trusted coin
- 988 CEReputable sourceWell documented
The Conversion of the Rus
In 988 Vladimir, grand prince of Kievan Rus, adopted Christianity from Constantinople and had his people baptized in the Dnieper. The conversion was sealed by a marriage alliance with the emperor Basil II. Byzantine priests, art, and the Church Slavonic liturgy followed, and Kyiv became a great centre of Orthodox Christianity.
Why it matters: The baptism of the Rus brought Russia, Ukraine, and much of eastern Europe into the Orthodox Christian world of Byzantium — shaping their religion, art, and script for a thousand years, down to the present day.
Sources - 10th–14th centuriesReputable sourceWell documented
The Varangian Guard
Around 988 the emperor Basil II received 6,000 warriors sent by Vladimir of the Rus and forged them into an elite personal bodyguard — the Varangian Guard. Recruited from Norse, Rus, and later Anglo-Saxon fighting men, these axe-wielding foreigners, loyal to the emperor alone, guarded the person of the ruler for centuries.
Why it matters: The Varangian Guard became legendary as the empire's most feared shock troops and most trusted bodyguards, a vivid link between Byzantium and the Viking world — and a sign of how the empire drew strength from far beyond its borders.
Sources- World History Encyclopedia. Varangian Guard · reference
- 4th–15th centuriesReputable sourceWell documented
Byzantine Art and the Icon
Across its long life Byzantium produced some of the most influential art of the Middle Ages: shimmering gold-ground mosaics, luxurious ivories and enamels, illuminated manuscripts, and above all the icon — a sacred image of Christ, the Virgin, or the saints, believed to open a window onto the divine. This tradition spread with Orthodoxy across the Slavic and Mediterranean worlds.
Why it matters: Byzantine art shaped the visual culture of eastern Christianity for a millennium and influenced medieval Europe and the Islamic world alike. The icon remains central to Orthodox worship today, and great collections such as Dumbarton Oaks preserve this heritage.
SourcesRelated timelines- History of Art → — The golden mosaics and icons of Byzantium
- 976–1025 CEReputable sourceWell documented
Basil II, the Bulgar-Slayer
Under Basil II the medieval empire reached its height. A tireless soldier-emperor, he crushed internal rebellions and waged a decades-long war against the Bulgarian Empire. After his decisive victory at Kleidion in 1014, he is said to have blinded thousands of Bulgar captives — earning the name 'Bulgar-Slayer.' By his death in 1025 he had roughly doubled the empire's territory.
Why it matters: Basil II brought Byzantium to its greatest medieval extent and power, master of the Balkans and the eastern frontier. His reign was the peak from which, after weaker successors, the empire would begin its long decline.
Sources- World History Encyclopedia. Basil II · reference
- 1054 CEReputable sourceWell documented
The Great Schism
Centuries of growing division between the Greek-speaking Eastern church, led by the Patriarch of Constantinople, and the Latin Western church, led by the Pope in Rome, came to a head in 1054. Legates of the Pope and the Patriarch of Constantinople excommunicated one another, formalizing a split over papal authority, doctrine, and ritual.
Why it matters: The Great Schism divided Christendom into the Roman Catholic and Eastern Orthodox churches — a breach that has never fully healed. It deepened the estrangement between Byzantium and the West that would soon turn to open hostility.
Sources - 1071 CEReputable sourceWell documented
The Battle of Manzikert
At Manzikert in eastern Anatolia in 1071, the Byzantine army was crushed by the Seljuk Turks and the emperor Romanos IV himself was captured. In the chaos and civil war that followed, the Turks overran Anatolia — the empire's heartland and its main source of soldiers and revenue.
Why it matters: Manzikert was one of the most catastrophic defeats in Byzantine history, permanently costing the empire most of Anatolia. The Byzantine appeal to the West for help against the Turks would soon help trigger the Crusades.
Sources- World History Encyclopedia. Battle of Manzikert · reference
Related timelines- The Crusades → — The defeat that helped spark the Crusades
- 1081–1118 CEReputable sourceWell documented
Alexios I Komnenos and the First Crusade
Alexios I Komnenos seized the throne in 1081 and hauled the empire back from the brink, rebuilding its finances, army, and coinage. Facing the Seljuk Turks, he appealed to the West for mercenaries — and in 1095 Pope Urban II answered by launching the First Crusade. The passing crusader armies helped Byzantium recover territory, but also sowed dangerous distrust between East and West.
Why it matters: Alexios founded the Komnenian dynasty that gave the empire a last age of strength. But his appeal for aid unleashed the Crusades — a movement that would ultimately turn against Byzantium itself.
Sources- World History Encyclopedia. Alexios I Komnenos · reference
Related timelines- The Crusades → — The Byzantine appeal that launched the First Crusade
- c. 1148 CEReputable sourceWell documented
Anna Komnene and the Alexiad
Anna Komnene, the learned daughter of Alexios I, wrote the Alexiad — a sweeping history of her father's reign and the coming of the First Crusade, composed in archaizing Greek. Barred from power after a failed bid for the throne, she retired to a convent and turned to scholarship, producing one of the masterpieces of medieval literature.
Why it matters: The Alexiad is a priceless eyewitness account of Byzantium and the Crusades from the Greek side, and Anna Komnene is often called the first female historian — a rare woman's voice from the medieval world.
Sources- World History Encyclopedia. Anna Komnene · reference
- 1143–1180 CEReputable sourceWell documented
Manuel I Komnenos and the Last Revival
Manuel I Komnenos, the last great emperor of his dynasty, presided over a final flowering of Byzantine power, wealth, and culture. An energetic and ambitious ruler, he campaigned from Italy to the Holy Land and dominated the empire's neighbours. But his overreaching wars strained the state, and his defeat by the Seljuks at Myriokephalon in 1176 dashed hopes of retaking the Anatolian interior.
Why it matters: Manuel's reign was the empire's last age of greatness. After his death the Komnenian order collapsed into instability — leaving Byzantium fatally weak on the eve of the Fourth Crusade.
Sources- World History Encyclopedia. Manuel I Komnenos · reference
- 1204 CEReputable sourceWell documented
The Fourth Crusade and the Sack of Constantinople
In 1204 the crusaders of the Fourth Crusade, diverted from the Holy Land, turned on Constantinople itself. They stormed and brutally sacked the great Christian city, carrying off or destroying its treasures and installing a short-lived Latin empire in its place. The Byzantine state fractured into rival successor kingdoms.
Why it matters: The sack of Constantinople by fellow Christians was a catastrophe from which Byzantium never truly recovered, leaving it a shadow of its former self and poisoning relations between Eastern and Western Christianity for centuries.
Sources- World History Encyclopedia. Fourth Crusade · reference
Related timelines- The Crusades → — The crusade that sacked Constantinople
- 1204–1261 CEReputable sourceWell documented
The Empire in Exile and the Recovery of Constantinople
After 1204 Byzantine exiles founded a successor state at Nicaea in Anatolia, which kept the imperial tradition alive and slowly gathered strength. In 1261 the Nicaean emperor Michael VIII Palaiologos recaptured Constantinople almost by chance, when his general slipped into the poorly defended city. The empire was restored — but as a much-diminished power.
Why it matters: The recovery of Constantinople in 1261 revived the Roman Empire and founded the Palaiologan dynasty that would rule to the end. Yet the restored state was small, poor, and encircled — a ghost of the empire the crusaders had shattered.
Sources- World History Encyclopedia. Empire of Nicaea · reference
- from 1354Reputable sourceWell documented
The Ottoman Advance into Europe
As Byzantium tore itself apart in civil wars, a new power rose on its eastern frontier: the Ottoman Turks. In 1354 the Ottomans seized Gallipoli and gained their first foothold in Europe, then swept across the Balkans — taking Adrianople around 1362 and encircling Constantinople. The emperors were reduced to vassals and tribute-payers of the sultan.
Why it matters: The Ottoman crossing into Europe doomed the Byzantine Empire, which was steadily surrounded and cut off. Within a century the Ottomans would swallow it whole and press on toward the heart of Europe.
SourcesRelated timelines- The Ottoman Empire → — The Turks gain their first foothold in Europe
- 1453 CEReputable sourceWell documented
The Fall of Constantinople
By 1453 the Byzantine Empire had shrunk to little more than the city of Constantinople, defended by fewer than 5,000 men. The young Ottoman sultan Mehmed II besieged it with the largest cannon yet built, and after a 53-day siege his troops breached the ancient walls on 29 May 1453. The last emperor, Constantine XI, died fighting, and the city fell.
Why it matters: The fall of Constantinople ended the Roman Empire after nearly 1,500 years and the Byzantine Empire after more than a thousand. It sent Greek scholars fleeing west with their manuscripts, helping fuel the Renaissance, and made the Ottomans the new masters of the region.
SourcesRelated timelines- The Ottoman Empire → — The Ottoman conquest that ended the empire
- 1461 CEReputable sourceWell documented
The Last Byzantines: The Fall of Trebizond
A few Byzantine splinter-states outlived Constantinople itself. The Despotate of the Morea in Greece fell to the Ottomans in 1460, and in 1461 the Empire of Trebizond, a Black Sea remnant that had endured since 1204, surrendered to Mehmed II after a siege. With it, the last independent fragment of the Roman world was extinguished.
Why it matters: The fall of Trebizond in 1461 marked the true final end of the Roman Empire, more than two thousand years after Rome's founding. Nothing remained of the Byzantine state — only its immense legacy in law, religion, art, and learning.
Sources