English:Byzantium and the Eastern Roman Empire
Byzantium and the Eastern Roman Empire
Introduction
For more than a thousand years, the eastern part of the Roman world was ruled from Constantinople, a city where Europe and Asia meet. Modern historians often call this state the Byzantine Empire, but its people usually thought of themselves as Romans. Their empire changed greatly over time, yet it kept important Roman traditions while developing a strongly Christian and increasingly Greek-speaking culture.
In this aiMOOC, you will explore how the Eastern Roman Empire survived after imperial rule disappeared in the western Roman provinces, how Constantinople became one of the great cities of the medieval world, and how emperors, soldiers, merchants, craftspeople, scholars, and religious communities shaped Byzantine history. You will also examine maps, buildings, coins, mosaics, icons, laws, and written sources as historical evidence.
Study the map carefully. The empire reached its greatest territorial extent under Justinian I in the sixth century. Its borders changed many times before and after this moment, so no single map represents all of Byzantine history.
After watching the overview, identify one idea that shows Roman continuity and one idea that shows change. Keep these two ideas in mind as you work through the course.
Learning Goals
By the end of this course, you should be able to explain why the words Byzantine and Roman can both be useful, locate Constantinople and important Byzantine regions on a map, describe major features of Byzantine government and society, explain the importance of Justinian and Theodora, interpret examples of Byzantine art and architecture, outline major turning points from the fourth to the fifteenth century, and use different kinds of historical evidence to build an argument.
Why "Byzantium" and "Eastern Roman Empire"?
The name can be confusing. The city of Constantinople had once been the Greek settlement of Byzantion, or Byzantium. In 330 CE, Emperor Constantine I dedicated the city as a new imperial capital. Modern historians later used the word Byzantine for the medieval Roman state centered on Constantinople.
The people of that empire did not normally say, "We are Byzantines" in the modern historical sense. They called themselves Romans, or Rhomaioi in Greek, and their rulers claimed to govern the Roman Empire. For this reason, Eastern Roman Empire emphasizes political continuity with ancient Rome, while Byzantine Empire is a useful modern label for the changing medieval state.
Using both terms helps you avoid a common mistake: imagining that one empire suddenly ended and a completely new one appeared. The transformation was gradual. Government, language, religion, borders, military organization, and culture all changed over centuries.
From Rome to Constantinople
The Roman Empire had long been too large to govern easily from one place. Emperors created several centers of power, and Constantine made Constantinople a major imperial capital. The city's position on the Bosporus connected the Mediterranean and Black Sea worlds and placed it near important routes between Europe and Asia.
In the fifth century, imperial rule in the western provinces broke apart. The last western emperor traditionally listed by historians, Romulus Augustulus, was removed in 476. The eastern government in Constantinople continued. Its rulers still considered themselves Roman emperors, and their state remained a major power in the eastern Mediterranean.
The map shows Constantinople in Byzantine times. Look for the peninsula, the harbors, major buildings, and the land walls. Geography did not make the city invincible, but it gave defenders important advantages.
Constantinople: Capital at a Crossroads
Constantinople stood beside the Bosporus, the narrow waterway linking the Black Sea with the Sea of Marmara and, through the Dardanelles, the Aegean and Mediterranean seas. Ships carrying grain, timber, wine, oil, ceramics, silk, metals, and many other goods passed through connected trade networks. Roads also linked the capital with the Balkans and Anatolia.
The city had imperial palaces, churches, markets, workshops, cisterns, harbors, bath buildings, public squares, and the great Hippodrome. It was a political center, a religious center, and a marketplace. People from many regions could be found there, including Greek speakers, Latin speakers, Armenians, Slavs, Syrians, Italians, and others at different times.
The famous land defenses included the Theodosian Walls, a complex system of walls, towers, and a ditch developed in the fifth century and repaired many times afterward. These defenses helped protect the capital during numerous attacks, although no wall could guarantee safety forever.
Life in the Capital
Daily life depended strongly on social position, occupation, wealth, gender, family connections, and period. Elite families could have access to education, offices, estates, and court life. Artisans and merchants worked in specialized trades. Laborers, sailors, servants, soldiers, clergy, monks, and nuns formed other important groups. Enslaved people were also part of Byzantine society.
The Hippodrome was more than a sports arena. Chariot races attracted large crowds, and the factions connected with racing could express social and political tensions. In 532, disorder linked to the Nika Revolt became a major challenge to Emperor Justinian I.
Water was essential for a large city. Aqueducts and huge underground cisterns stored and moved water. Food supplies also depended on long-distance transport and government organization. The capital could be rich and impressive, but it also faced fires, earthquakes, disease, shortages, and political unrest.
Government and Society
The Byzantine emperor stood at the center of government. Emperors issued laws, appointed officials, led diplomacy, commanded military resources, and played an important role in religious affairs. However, an emperor was not all-powerful in practice. Success depended on armies, administrators, tax revenues, court alliances, church leaders, provincial elites, and public support.
A large bureaucracy kept records, collected taxes, managed state property, and carried out imperial orders. Roman administrative traditions continued, but offices and institutions changed as the empire faced new problems. The court used ceremonies, clothing, titles, architecture, and carefully organized rituals to display imperial authority.
Society was unequal. Landowners, officials, military leaders, and church institutions could hold considerable resources, while farmers produced much of the food and tax base. Towns and cities supported markets and crafts. Social mobility was possible in some periods through the army, church, administration, trade, or education, but opportunity was never equal.
Justinian I and Theodora
Emperor Justinian I ruled from 527 to 565. His reign is one of the best-known periods of Byzantine history because it combined ambitious military campaigns, legal reform, building projects, religious disputes, and serious crises.
This sixth-century mosaic in the church of San Vitale in Ravenna shows Justinian with officials, soldiers, and churchmen. It is not a photograph of court life. It is a carefully designed image of imperial and religious authority. Notice the front-facing figures, rich clothing, gold background, and the emperor's central position.
Empress Theodora was Justinian's wife and an influential member of the imperial court. Ancient writers describe her as participating in high-level politics, although their accounts are shaped by strong opinions and sometimes contradict one another. During the Nika Revolt, a famous account by the historian Procopius presents Theodora as arguing against flight when the government was in danger.
Justinian's generals, especially Belisarius and Narses, reconquered parts of North Africa, Italy, and southern Iberia that had once belonged to the western Roman Empire. These campaigns expanded imperial territory but were extremely costly. The empire also fought on its eastern frontier against the Sasanian Persian Empire.
As you watch, separate achievements from costs. A ruler can strengthen one part of a state while creating pressure somewhere else.
Roman Law and the Justinianic Code
Justinian ordered legal experts to organize centuries of Roman law and legal writing. The result is usually called the Corpus Juris Civilis, or Body of Civil Law. It included a collection of imperial laws, a digest of opinions by earlier Roman jurists, a textbook for students, and later laws issued during Justinian's reign.
This legal project did not create Roman law from nothing. It selected, edited, organized, and updated older material. The compilation became highly influential in later legal traditions, especially after renewed study of Roman law in medieval western Europe.
Byzantine legal culture also continued to develop after Justinian. This manuscript image reminds us that laws and religious rules were copied, interpreted, and reorganized across many centuries. Historians study manuscripts not only for their words but also for clues about who copied, used, and preserved them.
Hagia Sophia and Byzantine Architecture
After the Nika Revolt damaged an earlier church, Justinian ordered a new Hagia Sophia to be built in Constantinople. The architects Anthemius of Tralles and Isidore of Miletus designed the great church, which was dedicated in 537.
The building is famous for its enormous central dome, semi-domes, arches, columns, galleries, and carefully controlled light. Its present appearance also shows later history: repairs, changes to decoration, and additions made after the Ottoman conquest. A building can therefore be both a monument from one period and a record of many later periods.
While watching the Smarthistory discussion, focus on three questions: How do the dome and supporting structures work together? How does light affect the interior? How might the building have communicated imperial and religious power?
Mosaics and Sacred Images
A mosaic is an image made from many small pieces, often stone, glass, or ceramic. Byzantine artists used mosaics to decorate important churches and palaces. Gold-colored backgrounds, frontal figures, symbolic gestures, inscriptions, and carefully arranged compositions could communicate religious ideas and status.
The Deesis mosaic in Hagia Sophia dates from the later Byzantine period. It shows Christ between the Virgin Mary and John the Baptist. The surviving faces display subtle modeling and expression. Studying details such as gaze, gesture, position, material, and damage can help you ask how medieval viewers may have experienced the image.
Do not treat all Byzantine art as identical. Styles, techniques, patrons, materials, and purposes changed across regions and centuries.
Christianity, Debate, and Iconoclasm
Christianity became central to the identity of the Eastern Roman Empire. Constantinople's patriarch was one of the leading bishops of the Christian world, and monasteries became important religious, economic, and cultural institutions. Missionaries connected with Byzantium helped spread Christianity among several Slavic peoples, while local rulers and communities shaped those traditions in their own ways.
One major controversy concerned icons, sacred images of Christ, Mary, and saints. During periods of Byzantine Iconoclasm in the eighth and ninth centuries, imperial governments restricted or opposed the religious use of icons. Supporters of icons defended their place in Christian devotion. The conflict involved theology, imperial policy, church authority, and politics. The veneration of icons was officially restored in 843.
An icon was not simply decoration. For believers, it could have a devotional function. When historians study iconoclasm, they must distinguish between what an image meant to medieval worshippers and how a modern museum visitor may see it.
Relations between Christians in the Greek-speaking East and Latin-speaking West also changed over time. Differences in language, church leadership, ritual, theology, and politics gradually deepened. The year 1054 is often used as a marker for the East-West Schism, but the separation between the Eastern Orthodox and Roman Catholic churches developed over a long period rather than in one instant.
Economy and Trade
Most people in the empire lived from agriculture. Farmers grew grains, olives, grapes, fruits, and other crops suited to local environments, while livestock provided meat, dairy products, leather, and transport. Land taxes were a major source of state revenue.
Cities supported workshops and markets. Byzantine artisans produced textiles, metalwork, glass, ceramics, jewelry, books, and luxury goods. Silk became an especially important high-value product. Constantinople's position connected merchants from the Mediterranean, Black Sea, Balkans, Anatolia, and regions farther east.
The gold solidus had been introduced in the late Roman Empire and remained an important stable gold coin for centuries. Coins are useful evidence because they can show rulers, titles, religious symbols, mints, and messages about authority. Their distribution can also help historians study trade and political influence.
Economic life was not equally prosperous in every century. War, plague, population changes, climate, taxation, and shifting trade routes affected different regions in different ways. Avoid describing Byzantine history as a simple straight line from wealth to decline.
War, Defense, and Diplomacy
The empire survived not because it won every battle, but because rulers combined military force with fortifications, diplomacy, taxation, alliances, intelligence, negotiation, and adaptation. Byzantine armies changed greatly over time.
From the seventh century onward, provinces known as themes became important parts of military and civil organization. The exact development of the theme system is debated by historians, but it helped connect regional administration with defense. The navy was also important, especially for protecting Constantinople and sea routes.
Byzantine forces used a famous incendiary weapon usually called Greek fire. Its exact formula is unknown. Sources describe it as especially useful in naval warfare, but modern reconstructions are uncertain, so historians should distinguish evidence from speculation.
Diplomacy could be as important as battle. Emperors exchanged gifts, arranged marriages, received foreign envoys, paid subsidies, used titles strategically, and tried to divide hostile coalitions. Byzantine rulers dealt with many neighbors and rivals, including Persians, Arabs, Bulgars, Rus, Pechenegs, Seljuk Turks, western European powers, and later the Ottomans.
A Timeline of Change
| Date or period | Event | Why it matters |
|---|---|---|
| 330 | Constantine dedicates Constantinople as an imperial capital. | The city becomes the political center of the eastern Roman world. |
| 476 | Imperial rule in the western Roman provinces traditionally ends with the removal of Romulus Augustulus. | The eastern empire continues from Constantinople. |
| 527–565 | Reign of Justinian I. | Major reconquests, legal codification, building, and religious conflict reshape the empire. |
| 532 | Nika Revolt. | A major uprising threatens Justinian's government and damages parts of Constantinople. |
| 537 | Hagia Sophia is dedicated. | The building becomes a landmark of Byzantine architecture and imperial Christianity. |
| Seventh century | The empire loses large territories and reorganizes under pressure from major wars. | A smaller but resilient medieval state emerges. |
| 843 | Official restoration of icons. | This marks the end of the second major phase of Byzantine iconoclasm. |
| 1054 | A major break between leading church authorities in Rome and Constantinople. | The date becomes a traditional marker in the longer East-West Schism. |
| 1071 | Battle of Manzikert. | A Byzantine defeat helps open a period of severe political and territorial crisis in Anatolia. |
| 1204 | The Fourth Crusade captures and sacks Constantinople. | Byzantine rule in the capital is interrupted and a Latin Empire is established. |
| 1261 | Constantinople is recovered by forces of Michael VIII Palaiologos. | Byzantine imperial rule returns, but the restored state is weaker than before 1204. |
| 1453 | Ottoman forces under Mehmed II capture Constantinople. | The Byzantine Empire ends, and the city becomes a major Ottoman capital. |
A timeline is useful, but it can hide complexity. Each event affected regions and groups differently, and long-term changes often matter as much as famous dates.
Crisis, Recovery, and the Fourth Crusade
By the eleventh century, the empire faced pressure from several directions. Internal struggles over the throne, military problems, and the loss of territory in Anatolia weakened imperial resources. At the same time, western European crusading movements and new political powers changed the eastern Mediterranean.
The Fourth Crusade was originally organized with a different goal, but in 1204 crusading armies captured and sacked Constantinople. A Latin Empire was established in the city, while Byzantine successor states formed in places such as Nicaea, Epirus, and Trebizond. The capture caused enormous destruction and deepened hostility between eastern and western Christians.
In 1261, forces of the Empire of Nicaea recovered Constantinople, and Michael VIII Palaiologos restored Byzantine rule there. Art and intellectual life continued to flourish, but the empire controlled much less territory and faced powerful neighbors.
The Fall of Constantinople in 1453
By the fifteenth century, the Byzantine Empire had been reduced largely to Constantinople and a few other territories. The expanding Ottoman Empire surrounded the capital. Sultan Mehmed II prepared a major siege using infantry, cavalry, a fleet, and large cannon.
This fifteenth-century miniature is a later visual representation of the siege. Like every source, it must be read critically. Ask what the artist wanted to show, which details may be symbolic, and which features can or cannot be checked against other evidence.
On 29 May 1453, Ottoman forces captured Constantinople. Emperor Constantine XI Palaiologos died during the city's final defense. The conquest ended the Byzantine Empire, but it did not erase Byzantine people, religious communities, art, scholarship, or memory. Constantinople became an Ottoman imperial capital and remained a major center of politics, religion, trade, and culture.
This TED-Ed video follows the changing history of Hagia Sophia. Use it as an example of how one building can belong to several historical periods and communities.
Byzantine Art, Learning, and Cultural Exchange
Byzantine culture grew from many traditions, including Roman government, Greek language and literature, Christianity, and the cultures of regions connected through trade, migration, diplomacy, and war. Constantinople was not isolated. It communicated with the Islamic world, the Caucasus, the Slavic lands, Italy, the Balkans, and the wider Mediterranean.
Byzantine scholars copied and studied ancient Greek literature, philosophy, science, history, and theology. Manuscript copying helped preserve works that might otherwise have been lost. Knowledge also moved through Arabic, Latin, Syriac, Armenian, and other scholarly traditions, so intellectual history is best understood as a network of exchange rather than a story of one civilization acting alone.
Byzantine artistic forms influenced Orthodox Christian regions far beyond the empire's borders. Domed churches, icons, mosaics, liturgical objects, and manuscript art developed in many local styles. In western Europe, Byzantine objects and artists also influenced medieval art.
Historical Thinking: How Do We Know?
Historians reconstruct Byzantium from many kinds of evidence. Written sources include chronicles, laws, letters, sermons, military manuals, tax records, saints' lives, and diplomatic texts. Material sources include coins, seals, buildings, pottery, weapons, inscriptions, textiles, and human remains. Artworks are evidence too, but they must be studied as designed objects rather than treated as simple photographs of the past.
Maps are interpretations. The map above reconstructs imperial territory in the sixth century from historical evidence. Borders in premodern states were often zones of influence rather than perfectly surveyed modern lines. When you read a historical map, ask who made it, what date it represents, what evidence it uses, and what choices the cartographer made.
Procopius is a good example of source criticism. He wrote works praising Justinian's buildings and military campaigns, but he also wrote the highly hostile Secret History. Historians compare these texts with other evidence instead of accepting either praise or criticism automatically.
A Source-Analysis Routine
When you examine a Byzantine source, first identify what kind of source it is and when it was created. Next, ask who created it and for what audience. Then describe what you can observe before interpreting it. Compare its claims with another source. Finally, decide what the source can tell you and what it cannot tell you.
This method works with texts, images, coins, maps, and buildings. It also helps you recognize that historical knowledge is built from evidence and argument, not from memorizing a list of dates.
Key Vocabulary
| Term | Clear meaning |
|---|---|
| Byzantine Empire | A modern historical name for the medieval Eastern Roman Empire centered on Constantinople. |
| Rhomaioi | Greek word used by Byzantine people to identify themselves as Romans. |
| Constantinople | Imperial capital on the Bosporus, today Istanbul. |
| Emperor | Supreme ruler of the Roman state, although real power depended on institutions and supporters. |
| Mosaic | Image made from many small pieces of material such as colored glass or stone. |
| Icon | Sacred image used in Eastern Christian religious practice. |
| Iconoclasm | Conflict over the legitimacy and use of sacred images. |
| Corpus Juris Civilis | Justinian's organized compilation of Roman law and legal writing. |
| Theme | A major provincial unit connected with military and civil administration in the medieval empire. |
| Orthodox Christianity | The Christian tradition that became central to Byzantine religious identity and later developed as the Eastern Orthodox Church. |
| Fourth Crusade | Crusading expedition whose forces captured Constantinople in 1204. |
Interactive Tasks
Quiz: Test Your Knowledge
What did most inhabitants of the medieval Eastern Roman Empire call themselves? (Romans) (!Byzantines) (!Ottomans) (!Franks)
Which city served as the capital of the Eastern Roman Empire for most of its history? (Constantinople) (!Athens) (!Alexandria) (!Ravenna)
Which emperor ordered the major sixth century compilation of Roman law? (Justinian) (!Constantine) (!Heraclius) (!Mehmed)
Who was the influential empress married to Justinian I? (Theodora) (!Irene) (!Zoe) (!Helena)
Which building was rebuilt under Justinian and dedicated in the sixth century? (Hagia Sophia) (!Colosseum) (!Parthenon) (!Pantheon)
What is a mosaic? (Image made from small pieces) (!Book of military orders) (!Type of tax district) (!Stone defensive tower)
What was Byzantine iconoclasm mainly about? (Use of sacred images) (!Choice of imperial capital) (!Design of gold coins) (!Control of grain prices)
What happened to Constantinople during the Fourth Crusade? (It was captured by crusaders) (!It became the Persian capital) (!It was founded by Constantine) (!It was abandoned by all residents)
What happened in 1261? (Byzantine rule returned to Constantinople) (!Justinian became emperor) (!Hagia Sophia was first dedicated) (!The western emperor was removed)
What event ended the Byzantine Empire in 1453? (Ottoman capture of Constantinople) (!Norman conquest of England) (!Mongol capture of Baghdad) (!Frankish conquest of Jerusalem)
Memory Game
| Constantinople | Capital city located beside the Bosporus |
| Justinian | Emperor linked with legal codification and western reconquests |
| Theodora | Empress who played an important role in sixth century politics |
| Hagia Sophia | Great domed church rebuilt during the sixth century |
| Mosaic | Picture formed from many small pieces of material |
| Icon | Sacred image used in Eastern Christian devotion |
| Theme | Provincial structure tied to medieval administration and defense |
| Solidus | Long lasting gold coin of the Roman and Byzantine economy |
Drag and Drop
| Match the correct terms. | Topic |
|---|---|
| Roman continuity | The eastern empire claimed the political inheritance of Rome |
| Bosporus | The strait beside the imperial capital |
| Justinianic law | The organized compilation of earlier Roman legal material |
| Iconoclasm | A conflict over sacred images and their religious use |
| Fourth Crusade | The expedition whose forces captured Constantinople |
...
Crossword Puzzle
| Constantinople | What was the main capital of the Eastern Roman Empire? |
| Justinian | Which emperor ruled during major sixth century reconquests and legal reform? |
| Theodora | Which empress was an influential partner of Justinian? |
| Mosaic | What art form uses many small pieces to make an image? |
| Iconoclasm | What word describes the Byzantine conflict over sacred images? |
| Orthodox | Which word completes the name Eastern Christian tradition linked to Byzantium? |
LearningApps
Cloze Text
Open-Ended Tasks
Easy
- Annotated Byzantine Map: Draw or digitally create a map showing Constantinople, the Bosporus, the Mediterranean Sea, the Black Sea, Anatolia, and the Balkans, then add short notes explaining why location mattered.
- Artifact Detective: Choose one coin, mosaic, icon, or building image from this course and create a one-page observation sheet separating what you see from what you infer.
- Byzantine Vocabulary Comic: Create a short comic that correctly uses at least six key terms from the course in a clear historical context.
- Timeline Cards: Make illustrated cards for eight major events, arrange them in chronological order, and write one sentence explaining why each event matters.
Standard
- Hagia Sophia Architecture Study: Create a labeled diagram or short video explaining how the dome, arches, semi-domes, columns, and light contribute to the building's design and meaning.
- Justinian and Theodora News Report: Produce a two-minute news report about the Nika Revolt that includes what is known, what comes from Procopius, and what remains uncertain.
- Byzantine Trade Interview: Write and perform an interview with a fictional merchant in Constantinople, using historically plausible goods, routes, risks, and currencies from the course.
- Iconoclasm Evidence Board: Build a balanced evidence board explaining why sacred images became controversial and how the conflict involved religion, politics, and authority.
Advanced
- Roman or Byzantine Debate: Prepare a structured debate on whether the state should be described mainly as Roman, Byzantine, or both, and support every claim with evidence from identity, government, language, and chronology.
- Comparing Historical Sources: Compare a written account, an artwork, and a map connected with Justinian's reign, then explain what each source can reveal and what it cannot.
- Constantinople Defense Project: Design a model, map, or digital presentation explaining how geography, walls, naval power, diplomacy, and logistics worked together in the defense of the capital.
- Museum Exhibition Byzantium: Curate a six-object mini exhibition with captions that connect law, religion, economy, art, warfare, and cultural exchange, then record a guided tour for visitors your age.
Learning Assessment
- Continuity and Change Assessment: Explain two important ways the Eastern Roman Empire continued Roman traditions and two important ways it changed, using evidence from different centuries.
- Constantinople Geography Assessment: Use a map to explain how the city's location created both economic opportunities and military challenges.
- Justinian Reign Assessment: Judge whether Justinian's reign should be remembered mainly as an age of achievement, an age of crisis, or both, and support your conclusion with at least four pieces of evidence.
- Byzantine Art Assessment: Analyze one mosaic or icon by describing its materials, composition, purpose, and historical context before interpreting its message.
- Fourth Crusade Assessment: Explain why the capture of Constantinople in 1204 was a turning point and how the recovery of the city in 1261 did and did not reverse its effects.
- Historical Source Assessment: Compare two different source types from the course and argue which is more useful for answering one specific historical question.
Evidence of Learning
Strong evidence of learning includes more than remembering names and dates. You should be able to show how facts connect, how interpretations are supported, and how knowledge can be transferred to new questions.
| Area | Evidence you can produce |
|---|---|
| Knowledge | Accurate explanations of Roman continuity, Byzantine change, major rulers, religious developments, and key turning points. |
| Geography | A clear map-based explanation of why Constantinople's location mattered for trade, defense, and communication. |
| Historical reasoning | Claims supported with evidence, awareness of cause and consequence, and recognition that change happened over long periods. |
| Source analysis | Careful distinction between observation and inference when using texts, maps, coins, buildings, and artworks. |
| Communication | Clear writing, speaking, visual design, and correct use of historical vocabulary for a chosen audience. |
| Products | Maps, timelines, videos, models, reports, exhibition captions, source analyses, or digital presentations that demonstrate understanding. |
| Transfer | Ability to apply ideas about continuity, geography, religion, trade, empire, and evidence to another medieval society or historical problem. |
OERs on the Topic
For additional open learning, explore The Metropolitan Museum of Art overview of Byzantium and Smarthistory's study of Hagia Sophia. When using any online source, check who created it, when it was updated, what evidence it uses, and whether other reliable sources agree.
Linked Learning Areas
Studying Byzantium connects History with Geography, Art history, Religious studies, Law, Economics, Architecture, and English. You practice reading informational texts, comparing sources, explaining cause and consequence, using academic vocabulary, and presenting arguments for different audiences.