Timeline Byzantine Empire: The Early Period

Byzantine Empire: The Early Period 26

• 325 Council of Nicaea -- defining Christian orthodoxy The First Council of Nicaea (325 AD), convened by Constantine, is the first ecumenical council of the Christian Church. Its primary task is to resolve the Arian controversy -- whether Christ is of the same substance as God (homoousios, the orthodox position) or merely similar (homoiousios, the Arian position). The council affirms the Nicene Creed, which defines Christian orthodoxy to the present day. Constantine presides, demonstrating the intimate connection between imperial authority and Christian doctrine that characterises the Byzantine state throughout its history.
• 330 – 610 Byzantine Empire: The Early Period (330–610) The Early Byzantine period spans from Constantine the Great's founding of Constantinople to the death of the Emperor Maurice and the accession of Heraclius in 610. It is simultaneously the last phase of the Roman Empire and the first phase of a distinctly Byzantine civilisation: Roman in law and institutional structure, Greek in language and high culture, Christian in religion. The period encompasses the Theodosian dynasty's completion of the Christianisation of the empire, the catastrophic loss of the Western Empire, the extraordinary reign of Justinian I (527-565) with his reconquest of the Mediterranean, the construction of Hagia Sophia, the codification of Roman law, and the Plague of Justinian -- the first pandemic in recorded history. It ends with the empire exhausted by the Persian wars, on the eve of the Arab conquests that will transform the medieval world.
• 330 – 337 Constantine the Great -- founder of the Christian empire Constantine I (ruled 306-337) is the pivotal figure of late antiquity: the emperor who legalises Christianity with the Edict of Milan (313), convenes the First Council of Nicaea (325) to establish orthodox Christian doctrine, and founds Constantinople (330) as the new imperial capital. Whether his conversion was genuine or strategic -- or both -- he transforms the Roman Empire irrevocably. The Church he empowers becomes the dominant institution of European civilisation for the next thousand years. He dies in 337, baptised on his deathbed.
• 337 – 395 The Constantinian dynasty -- succession crises and Julian the Apostate Constantine's death triggers a succession crisis: his three sons divide the empire and immediately go to war. Constantius II eventually reunites it but faces repeated usurpations. The most dramatic episode is the reign of Julian (361-363) -- Constantine's nephew, raised Christian, who secretly converts to paganism and attempts to reverse the Christianisation of the empire. Called 'the Apostate' by Christian writers, Julian is a brilliant administrator and general who dies in battle against Persia (363) before his religious restoration can take hold. Christianity resumes its advance.
• 380 Edict of Thessalonica -- Christianity becomes the state religion Theodosius I issues the Edict of Thessalonica on 27 February 380, making Nicene Christianity the state religion of the Roman Empire and declaring all other religious practices illegal. Pagan temples are closed; the Olympic Games (held since 776 BC) are abolished in 393 as a pagan festival. The edict marks the completion of the Christianisation of the empire that Constantine began. Theodosius is the last emperor to rule both halves of the Roman Empire; at his death in 395 the empire is permanently divided.
• 395 Permanent division of the Empire At the death of Theodosius I (395), the empire is divided between his sons: Arcadius (East, capital Constantinople) and Honorius (West, capital Ravenna). This is the last division -- the two halves never reunite. The Western Empire disintegrates under barbarian pressure; the Eastern Empire, richer, more urbanised and better governed, survives. The Byzantine Empire inherits the Eastern half's institutions, army, bureaucracy and tax base.
• 408 – 450 Theodosius II -- walls, law and the university Theodosius II (408-450) is the longest-reigning emperor of the early period. His most lasting achievements: the Theodosian Walls (completed 413) -- the triple land walls that protect Constantinople for 1,000 years; the Codex Theodosianus (438) -- the first systematic compilation of Roman imperial law; and the University of Constantinople (425) -- one of the first universities in the world, with 31 chairs in Greek and Latin grammar, rhetoric, philosophy and law. Theodosius dies falling from a horse; his sister Pulcheria manoeuvres to succeed him.
• 413 The Theodosian Walls -- the greatest fortification of the ancient world The Theodosian Walls, completed in 413 under the regent Anthemius during the minority of Theodosius II, are the most formidable urban fortification in the ancient world: a triple line of walls, moat and towers stretching 5.7km from the Sea of Marmara to the Golden Horn, protecting Constantinople's landward side. The outer wall is 2m thick and 8.5m high; the inner wall is 4.5m thick and 12m high, with 96 towers. They successfully repel every attacker for over 1,000 years -- including Attila, the Avars, the Arabs and the Bulgars -- until Mehmed II's cannon finally breach them in 1453.
• 451 Council of Chalcedon -- the great theological divide The Council of Chalcedon (451) is the fourth ecumenical council and the most divisive in Christian history. It defines the two natures of Christ (human and divine) as united in one person -- the Chalcedonian definition. The churches of Egypt (Coptic), Ethiopia, Armenia and Syria reject this formula and become 'non-Chalcedonian' or 'miaphysite' -- permanently separating from the Byzantine church. The theological controversy damages Byzantine control over Egypt and Syria, weakening resistance to the Arab conquests two centuries later.
• 476 Fall of the Western Empire -- Byzantium alone On 4 September 476, the Germanic chieftain Odoacer deposes Romulus Augustulus, the last Western emperor, at Ravenna. He sends the imperial regalia to Constantinople, declaring there is no need for a separate western emperor. From the Byzantine perspective, the empire is not divided -- there is simply one emperor now, in Constantinople. Byzantium considers itself the legitimate continuation of the Roman Empire throughout its history and never accepts the 'fall of Rome' framing that Western historians later adopt.
• 482 – 519 The Acacian Schism -- first split with Rome The Acacian Schism (482-519) is the first major split between the churches of Rome and Constantinople. Emperor Zeno issues the Henotikon (482), a compromise formula on the nature of Christ intended to reconcile the Chalcedonian and non-Chalcedonian churches. Pope Felix III rejects it and excommunicates Patriarch Acacius of Constantinople. The schism lasts 35 years, prefiguring the Great Schism of 1054. It is resolved by Justin I (518-527), who abandons the Henotikon and aligns with Rome -- paving the way for his nephew Justinian's reconquest of the West.
• 527 – 565 Justinian I -- the greatest Byzantine emperor Justinian I (527-565) is the most ambitious and consequential Byzantine emperor. Born a Latin-speaking peasant from Illyria, he rises through his uncle Justin I's patronage to become the last emperor who speaks Latin as his first language and the last to attempt the reconquest of the entire Roman world. His reign is the apex of Byzantine power: the Corpus Juris Civilis codifies Roman law; Belisarius reconquers North Africa and Italy; Hagia Sophia is built in five years; the Plague of Justinian kills millions. He rules for 38 years, sleeping barely four hours per night, earning the nickname 'the emperor who never sleeps.'
• 527 Theodora -- empress and co-ruler Theodora, Justinian's wife and co-ruler, is one of the most remarkable women in Byzantine history. Born into the circus -- her father was a bear-keeper at the hippodrome -- she works as an actress and courtesan before meeting Justinian, who changes the law to allow him to marry her. As empress she is Justinian's equal partner in government: she holds her own court, corresponds with foreign rulers, appoints bishops, and in the Nika Riots (532) delivers the speech that saves Justinian's throne. She dies of cancer in 548, 17 years before Justinian.
• 529 – 534 Corpus Juris Civilis -- Roman law codified Justinian commissions the jurist Tribonian to compile all Roman law into a coherent system: the Corpus Juris Civilis (529-534), comprising the Codex (imperial constitutions), Digest (juristic writings), Institutes (textbook) and Novels (new laws). The Corpus Juris Civilis becomes the foundation of legal systems across Europe, the basis of canon law, and the direct ancestor of the legal codes of France, Germany, Italy, Scotland, Quebec and Louisiana. It is arguably Justinian's most enduring achievement -- more lasting than any military conquest.
• 532 – 537 Hagia Sophia built -- five years, one masterpiece Hagia Sophia (Holy Wisdom) is designed by the mathematician Anthemius of Tralles and the engineer Isidore of Miletus and built in the extraordinary time of five years (532-537). Its central dome, 31 metres in diameter, appears to float on a ring of light from 40 windows at its base -- an effect achieved by the dome's unprecedented engineering, which transfers its weight through pendentives to four massive piers. On its dedication (27 December 537), Justinian reportedly says: 'Solomon, I have surpassed you.' It remains the world's largest cathedral for 1,000 years.
• 532 The Nika Riots -- Constantinople burns, Justinian nearly flees The Nika Riots (January 532) begin as a dispute between the chariot-racing factions (Blues and Greens) in the hippodrome and escalate into a full-scale urban insurrection that burns much of Constantinople and nearly topples Justinian. As the emperor prepares to flee by sea, Theodora delivers her famous speech: 'Royalty is a fine burial shroud.' Justinian stays. His generals Belisarius and Mundus trap the rioters in the hippodrome and slaughter approximately 30,000 people. The riots destroy much of the city -- including the original Hagia Sophia -- but clear the ground for Justinian's great building programme.
• 533 – 534 Belisarius conquers North Africa -- the Vandal Kingdom destroyed Justinian's general Belisarius lands in North Africa with 15,000 men in 533 and destroys the Vandal Kingdom in two battles -- the Ad Decimum and Tricamarum. The Vandal king Gelimer surrenders; North Africa, lost to the Vandals in 429, is restored to the empire in less than a year. It is one of the most rapid and complete military conquests in history. Belisarius returns to Constantinople for a triumph -- the first awarded to a non-imperial general in over 500 years -- bringing the Vandal treasure including the Jewish Temple menorah looted from Jerusalem in 455.
• 535 – 554 The Gothic Wars -- Italy reconquered at ruinous cost The Gothic Wars (535-554) see Belisarius and then Narses reconquer Italy from the Ostrogoths in a campaign lasting 20 years. Belisarius campaigns brilliantly with inadequate resources -- capturing Ravenna by trickery in 540 -- but the war is renewed by the Gothic king Totila, who reconquers most of Italy and even briefly captures Rome (546). Narses finally defeats and kills Totila at the Battle of Busta Gallorum (552). Italy is devastated: Rome's population falls from perhaps 500,000 to under 30,000. The reconquest is complete -- but the empire cannot hold it. The Lombards invade in 568, 14 years after the war ends.
• 541 – 549 Plague of Justinian -- the first pandemic The Plague of Justinian (541-549, with recurrences until c.750) is bubonic plague -- the same disease that causes the Black Death of 1347 -- striking the Byzantine Empire at the peak of its power. It arrives in Constantinople from Egypt in 541 and kills 5,000 people per day at its peak; Justinian himself contracts it and survives. The total death toll across the Mediterranean world is estimated at 25-50 million -- perhaps half the population of the empire. The plague permanently undermines Justinian's military and financial capacity and contributes directly to the failure to hold Italy and the vulnerability to the Arab conquests.
• 548 Death of Theodora Theodora dies of cancer on 28 June 548, aged approximately 48. Her death is a devastating personal blow to Justinian, who never remarries. Her political importance is demonstrated by what changes after her death: Justinian becomes more autocratic, more indecisive and more isolated. Several of the theological and political positions she had championed -- including her support for non-Chalcedonian Christianity -- are quietly reversed. Justinian survives her by 17 years, increasingly withdrawn and obsessed with theological controversy.
• 565 Death of Justinian -- the empire overextended Justinian dies on 14 November 565, aged approximately 83, having reigned for 38 years. His legacy is paradoxical: he reconquers the Roman world but cannot hold it; he builds Hagia Sophia but presides over the plague that kills millions; he codifies Roman law but leaves the treasury bankrupt. His successors -- Justin II, Tiberius II, Maurice -- face the consequences: the Lombards take Italy (568), the Avars and Slavs devastate the Balkans, the Persians renew their wars. The great imperial overstretch of Justinian's reign leaves the empire structurally vulnerable to the catastrophes of the 7th century.
• 568 Lombard invasion -- Italy lost again The Lombards -- a Germanic people from the Danube region -- invade Italy in 568, just 14 years after the end of the Gothic Wars. They conquer most of northern and central Italy rapidly, establishing the Lombard Kingdom. Rome, Ravenna and Naples remain Byzantine, but the dream of a reunited Roman Empire in the West is permanently ended. The Byzantine territories in Italy (the Exarchate of Ravenna) survive until 751. The Lombard invasion demonstrates the fundamental impossibility of Justinian's reconquest: the empire simply does not have the resources to garrison and administer the reconquered territories.
• 572 – 591 Maurice -- administrative genius on a crumbling empire Maurice (582-602) is one of the ablest administrators of the early Byzantine period: he reorganises the empire's provincial government into Exarchates (Italy and Africa), writes a military manual (Strategikon) that remains influential for centuries, and wins a brilliant campaign against Persia (591) that restores Armenian and Mesopotamian territories without ransom -- by supporting the Persian prince Khosrow II against a usurper. Maurice's reward is that Khosrow II, once restored, becomes the empire's most dangerous enemy under Heraclius. Maurice is overthrown and executed by the mutinous centurion Phocas in 602.
• 590 – 604 Pope Gregory the Great -- the Church fills the Western vacuum Gregory I (590-604), bishop of Rome during the most dangerous period of the Lombard invasions, effectively governs Rome in the absence of effective Byzantine authority -- negotiating with the Lombards, feeding the poor from Church estates, and sending Augustine to convert the Anglo-Saxons (596). Gregory establishes the practical independence of the papacy from Byzantine imperial authority and creates the institutional model of the medieval Church. His relationship with Constantinople is correct but tense -- he resents the Patriarch of Constantinople's claim to the title 'Ecumenical Patriarch.'
• 602 – 610 Phocas -- the tyrant and the Persian catastrophe Phocas (602-610), the centurion who overthrows Maurice, is one of the most brutal and incompetent emperors in Byzantine history. His reign of terror alienates the aristocracy, the Church and the army. Khosrow II of Persia, using the pretext of avenging his patron Maurice, launches a devastating invasion that overruns Syria, Palestine and Egypt. When Heraclius, the exarch of Africa, sails to Constantinople and overthrows Phocas in 610, the empire is on the brink of collapse. Heraclius's first sight of the devastation reportedly prompts him to ask his prisoner Phocas: 'Is this how you have treated the empire?' Phocas replies: 'Will you do better?'
• 610 Heraclius accedes -- the empire at its lowest point Heraclius (610-641) comes to power when the Persian armies have overrun Syria, Palestine and Egypt and stand at the Bosphorus. The empire's situation is so desperate that Heraclius considers abandoning Constantinople and transferring the capital to Carthage. Instead, he negotiates a humiliating peace with the Avars (paying tribute to buy time), completely reorganises the army and launches one of the most extraordinary military campaigns in history -- the Persian campaigns of 622-628 that recover all lost territories and destroy the Sassanid Empire. The recovery is short-lived: the Arab conquests begin within a decade.