A map of the Byzantine Empire

Visualizing Byzantium in the year 1200

This is a computer reconstruction of the Byzantine capital at its apogee, just before the Fourth Crusade. Alongside detailed renderings of the Hippodrome and Hagia Sophia, it includes dozens of the imperial city’s less famous monuments, many of which can still be found in modern Istanbul. The reconstruction is a work in progress, and the Byzantium 1200 X account routinely posts updates.

Rise and fall of the Byzantine Empire in 60 seconds

In 330 CE, Emperor Constantine made the bold move of shifting the Roman capital to Byzantium and renaming it Constantinople. This decision helped shape the Eastern Roman Empire, or what we now call the Byzantine Empire. Here’s how the city rose to global prominence, and why its legacy lingers today.

The top 10 Byzantine emperors

"The History of Byzantium" podcast, hosted by Robin Pierson, tells the entire history of the Byzantine Empire, from Constantine to the fall of Constantinople. As of this writing, it isn’t quite done, but there are more than 300 episodes to peruse. The episode linked here, with guest Anthony Kaldellis, ranks the top 10 Byzantine emperors.

The western Roman Empire fell in the 5th century CE amid invasions, weakness

A mix of over-expansion, political instability, a weak military and economy, and the broad invasion of the Eurasian Huns prompted the downfall. Its eastern half, the Byzantine Empire, would last for another millennium.

What was the Fourth Crusade?

Originally destined for Jerusalem, the Crusaders became entangled in a Byzantine civil war, and found themselves besieging the greatest city in Christendom. After breaching the sea walls and subjecting the city to the worst sack in its history, they installed a Flemish nobleman as Latin emperor of Constantinople.

The unusual connection between Venice and Byzantium

This article explores the complicated relationship between Venice and the Byzantine Empire. Venice grew up in the shadow of Byzantium, serving as a trade partner and faithful ally for centuries. Gradually, relations grew hostile, and Venetian ships would carry the Fourth Crusade to its fateful rendezvous with Constantinople. Visitors to San Marco can still see marble and porphyry from Constantinople, built into the walls of Venice’s preeminent church.

Medieval Europe was a patchwork of hundreds of competing states

In the Middle Ages, Europe was divided into hundreds of kingdoms, duchies, and territories, bearing little resemblance to modern borders. This map captures the political landscape in 1444, as the Ottoman Empire was in the midst of its rise.

Watch the British Empire expand and recede over 5 centuries

This interactive map traces the British Empire from 1450 to today—showing its explosive 19th-century expansion to one-quarter of the world's land and its steady contraction after World War II.

The final war between the Persian and Byzantine empires

The Arab conquests of the seventh century, which swept over Egypt, Syria, and Mesopotamia, were made possible by a catastrophic generation-long war between the Byzantine and Persian Empires. That war, in turn, was the last act in a struggle that had gone on for centuries, and shaped the whole subsequent history of the Middle East.

The century-long debate over religious images in Byzantium

The iconoclast controversy, which tore Byzantium apart in the eighth and ninth centuries, centered on the use of sacred images (or icons) in Christian worship. The Iconoclasts (literally, “icon smashers”) regarded sacred images as sacrilegious; their opponents, the Iconophiles (“icon lovers”), defended icons as aids to personal devotion. After decades of struggle, the Iconophiles prevailed; their victory ensured that icons, and the brilliant mosaics inspired by them, remained a feature of Byzantine churches.

The underground cities of the Byzantine Empire

This TED-Ed video explores the mysterious cave cities of Cappadocia. Although their oldest sections may go back to the Bronze Age, most of these subterranean complexes were excavated during the Byzantine period, when the locals went underground to take shelter from Arab raiders. Monasteries were also cut into pinnacles of the local tufa, and decorated with frescoes that have often survived to the present.

Mapping Russia's historical borders

This interactive map illustrates how the country’s borders have changed over the centuries, dating all the way back to the year 862, when the Varangian king Rurik assumed leadership of Ancient Rus. Scroll down to see how Russia vastly expanded its territory in the 16th and 17th centuries, and skip to 1991 to see which countries gained independence after the fall of the USSR.

Explore the medieval world in this 14th-Century map

This virtual replica of a 14th-Century map allows viewers to see the medieval world through a Christian framework. Jerusalem is the center axle of the map, harkening back to the Bible's Old Testament, which states Jerusalem is the "centre of...

Maritime trade in the Mediterranean accelerated during the late Bronze Age

This map illustrates the vibrant trade networks of the eastern Mediterranean during the Late Bronze Age (circa 1500–1200 BCE), highlighting an era of growing interconnectivity among major powers including Egypt, the Hittite Empire, Mesopotamia, and others.

The mosaics of San Vitale, Italy's Byzantine city

This video explores the unique artistic heritage of Ravenna, the center of Byzantine power in Italy. The city’s churches and baptistries still sparkle with a dazzling array of Byzantine mosaics. The most famous of these, in the Church of San Vitale, show Justinian and his wife Theodora with their courtiers. A visit to Ravenna – or at least a look at this video – is highly recommended to anyone interested in Byzantine history or art.

How the Code of Justinian formed the basis of modern law

This video explores the significance of Justinian’s Corpus Juris Civilis. The most important component of the Corpus, the Digest, collected the opinions of eminent Roman jurists. The Digest went on to become the legal framework of medieval Europe, and the basis for the civil codes used across two-thirds of the globe today—an underappreciated legacy of Byzantium.

Exploring the Hippodrome of Constantinople

The Hippodrome had room for about 80,000 spectators (more than the Colosseum, but less than Rome’s Circus Maximus). It was simultaneously Constantinople’s premier entertainment venue and its greatest political theater: the emperor routinely watched the games, and sometimes communicated with the crowd through a herald. The worst riot in Byzantine history, the Nika Revolt, began when the factions of the Hippodrome united in opposition to Justinian.

Explore the system of ancient Roman roads with this interactive

The Itiner-e map includes unpaved secondary roads that connected farms and towns to the empire's primary routes. Explore routes, view three-dimensional elevation, and compare the old roads to contemporary ones with this sprawling interactive project.

A timeline of key events during each period of Egyptian history

This timeline shows the dates, periods, dynasties, and significant events in the history and art of ancient Egypt from the Predynastic Period (before 3100 BCE) to the end of the Roman Period (395 CE).

The Inca Empire: a timeline

When did the Inca Empire solidify into an empire? When was it invaded by the Spanish? What remains of it today? Click through this timeline to learn more.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Explaining the rich heritage of the ancient Greeks

Though only a unified empire for a decade under Alexander the Great, the ancient Greeks left lasting cultural influence throughout the modern world. Curious about ancient Greece? 1440's got your breakdown of the ancient civilization.

View depictions of world maps throughout history

The first map to use latitude and longitude positions was created by Ptolemy in 150 CE, over 700 years after the oldest known world map, the Imago Mundi, was made with a Babylonian clay tablet. The Spanish crown created a secret master map from hundreds of sailors’ reports.

Cold War summary on a map

The Cold War spanned much of the world, going far beyond the main territories of the principal players: the US and the Soviet Union. This video map shows where the action took place, from the wars in Southeast Asia to the Suez Canal in Egypt.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

Ukraine's contested Donbas region: a visual explainer

Russia's heavily industrialized eastern Donbas region has been largely controlled by Russian separatists since 2014. Here's everything you need to know on the key strategic region.

How Eastern Orthodox and other Christians celebrate Easter differently

Western churches switched to the Gregorian calendar in 1582, though the Orthodox Church still calculates Easter using the Julian calendar, which runs 13 days behind. Orthodox Easter also must always follow Jewish Passover. The result is two Easters that can fall up to five weeks apart.

The Russia-Ukraine conflict is the largest ground war in Europe since World War II in casualties, forces mobilized, and displacement of civilians.

See photos of Meteora, a mountainous site in central Greece, home to 14th-century monasteries perched atop soaring outcroppings.

In 1963, a basement renovation in Turkey revealed a passageway to a hidden, multilevel underground city that once housed as many as 20,000 people

According to the physics of black holes, our 4D reality may be a hologram—a projection of information coded on a 2D surface on the edge of the universe.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

Visualize the path of every solar eclipse from 1900 to 2099 and see what each looks like when observed from different locations on Earth.

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

Explore the history, structure, and species of Australia's Great Barrier Reef with this interactive journey narrated by Sir David Attenborough.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

The syncytiotrophoblast is the outer layer of the placenta and the largest human cell, spanning an area about twice that of a king-sized bedsheet.

The term 'algorithm' originated from the Latinized name of al-Khwārizmī, a 9th-century mathematician whose works introduced Arabic numerals and the decimal-based numeral system to Europe and whose treatise 'Al-Jabr' gave algebra its name.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

Scientists can determine Earth's past climate conditions by analyzing air trapped in microscopic bubbles within ice cores—columns of compressed snow layers that build up over hundreds of thousands of years.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

Watch what the Ebola virus does inside our cells and organs in order to spread and survive.

The Mona Lisa's celebrity status and repeated restorations have obscured what made the painting so revolutionary for its time

Iran's Revolutionary Guard Corps is independent of Iran's regular army and is one of the most powerful and influential military-political organizations in the Middle East.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Recent research found that the brain doesn't seem to massively rewire following amputation—upending earlier beliefs about the cause of phantom limb pain.

The hormonal disorder PCOS was renamed PMOS in 2026, a move designed to improve care and research by shifting the focus to the hormonal causes of this condition that affects 1 in 8 women.

Prince's sexually explicit 1984 track 'Darling Nikki' attracted the ire of the Parents Music Resource Center, an advocacy group that inspired the Parental Advisory sticker, even though the song ends with a Christian message.