Constantinople

• 1. Introduction

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  Constantinople stood at the crossing point of two continents and two seas, a city so singular that it was known simply as "the City" to everyone who lived within or near its walls. Perched on a peninsula at the southeastern tip of Thrace, with the Bosporus to the east, the Golden Horn to the north, and the Sea of Marmara to the south, its geography was a kind of destiny. For more than fifteen hundred years, from its formal consecration in 330 to the abolition of the Ottoman sultanate in 1922, it served as the capital of four successive empires: Roman, Byzantine, Latin, and Ottoman. How does a single city hold the fate of so many civilizations? What made its walls stand for nearly nine centuries against assault after assault? And what happened when, at last, they fell? Those questions run through the entire arc of Constantinople's life.

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• 2. Before the City

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  Pliny the Elder, in his Natural History, recorded the first known name of a settlement on this site: Lygos, likely of Thracian origin, founded sometime between the 13th and 11th centuries BC. By the time Greek colonists arrived, that earlier settlement had apparently been abandoned. Around 657 BC, settlers from the city-state of Megara established Byzantium, across from the town of Chalcedon on the Asiatic shore of the Bosphorus. The founding myth credited a leader named Byzas, though later Byzantines would claim the city honored two men, Byzas and Antes. One ancient verse, preserved by Hesychius of Miletus, described the site as "a narrow strip of the Thracian shore at the mouth of the Pontos, where fish and stag graze on the same pasture." Darius I annexed Byzantium in 512 BC, finding its position at the narrowest point of the Bosphorus ideal for a pontoon bridge into Europe. Persian rule lasted until 478 BC, when a Greek army under the Spartan general Pausanias recaptured it. A treaty struck with Rome around 150 BC, trading tribute for independent status, allowed Byzantium to enter Roman rule intact and enjoy nearly three centuries of peace under the Pax Romana. Even then, the historian Cassius Dio recognized its value: when Emperor Septimius Severus razed the city in 196 for backing a rival claimant, Dio condemned the act, calling Byzantium "a strong Roman outpost and a base of operations against the barbarians from Pontus and Asia."

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• 3. Constantine's New Rome

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  Constantine the Great saw in Byzantium what Rome could no longer offer. Rome was too distant from the frontiers, too comfortable for disaffected politicians, and burdened by a thousand years of expectation. Byzantium, by contrast, sat where an emperor could reach the Danube or the Euphrates quickly, draw supplies from the workshops of Roman Asia, and fill the treasury from the wealthiest eastern provinces. Construction began in 324, and on the 11th of May 330 the city was renamed Constantinople and dedicated to Constantine. It was divided, like Rome, into 14 regions. Public works went up in great haste, with columns, marbles, doors, and tiles stripped from temples across the empire and hauled to the new capital. On the 18th of May 332, Constantine announced free grain distributions matching Rome's own practice; at the time, 80,000 rations were handed out daily from 117 distribution points. At the city's center rose the Augustaion square, flanked by a new senate-house and the Great Palace, with its imposing entrance called the Chalke. Nearby stood the Hippodrome, seating over 80,000 spectators, and the Forum of Constantine, where a tall column bore a statue of the emperor himself in the guise of Helios. The great street called the Mese ran from the Augustaion across the hills to the Golden Gate, stretching eventually to a total length of seven Roman miles. The Theodosian Walls, built in 413-414, enclosed an area roughly equivalent to Old Rome within the Aurelian walls, some 1,400 hectares in all.

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• 4. The Walls That Held

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  Theodosius II built the triple walls in 413-414, raising them to 18 metres and digging a moat with palisades in front. Those fortifications were not breached until the age of gunpowder. Constantinople's location did much of the defensive work on its own: the Golden Horn to the north and the Sea of Marmara to the south meant that only a narrow land front required walls at all. The Anastasian Wall, a 60-kilometre chain of fortifications across the Thracian peninsula, added a further outer perimeter from the 5th century onward. Arab armies of the Umayyad Caliphate besieged the city twice, from 674 to 678 and again from 717 to 718. The land walls held both times, and a newly developed incendiary substance called Greek fire allowed the Byzantine navy to destroy the Arab fleets. In the second siege, Khan Tervel of Bulgaria intervened on the Byzantine side and was afterward called the Saviour of Europe. Fame for those walls reached as far as the Chinese histories of the Tang dynasty, which described the city's massive fortifications and even recorded how it had been besieged in the 7th century by Mu'awiya I. The Theodosian Walls were so admired that they were imitated elsewhere, including at Caernarfon Castle. The defenses proved impenetrable for nearly nine hundred years, until a Hungarian gunsmith named Urban built a cannon powerful enough to do what armies could not.

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• 5. The Sack of 1204

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  On the 12th of April 1204, Crusaders from the Golden Horn breached the sea walls and poured into Constantinople. The Fourth Crusade had been diverted against the city through a scheme involving Philip of Swabia, Boniface of Montferrat, and the Doge of Venice, despite a papal excommunication. The immediate trigger was the claim of Alexios IV Angelos, whose inability to pay his promised rewards to the western soldiers created tensions that ended in his imprisonment and execution in February 1204. The historian Steven Runciman called what followed "unparalleled in history." His description of the sack is direct: drunken soldiers tore down silken hangings in Hagia Sophia, pulled the great silver iconostasis apart, trampled sacred books and icons, and a prostitute sat on the Patriarch's throne singing a ribald French song. The University of Constantinople, founded in the 5th century and containing more than 100,000 volumes in its Imperial Library, was ransacked. Monumental sculptures that had adorned the Hippodrome for centuries, including a Herakles attributed to the 4th-century BC sculptor Lysippos and figures of Hera, Paris, and Helen, were pulled down and melted for coinage. The estimated population of 400,000 before the attack was reduced to a fraction; about one third of those who remained were left homeless. The city did not recover its former scale. When the Nicaean emperor Michael VIII Palaiologos retook it in 1261, only 35,000 people were living there.

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• 6. The Fall to Mehmed II

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  By the end of March 1453, Emperor Constantine XI ordered a census of able-bodied defenders. His chancellor George Sphrantzes recorded the result: 4,773 Greeks and 200 foreigners, with volunteers from outside numbering "hardly as many as three thousand," leaving something under 8,000 men to defend a perimeter wall of twelve miles. Mehmed II, 21 years old at the time, had spent the preceding year sealing off the city's supply lines. He struck peace treaties with Hungary and Venice in 1452 and built the fortress Boğazkesen at the narrowest point of the Bosphorus to block passage between the Black and Mediterranean seas. Urban's cannon was transported from the Ottoman capital of Edirne to the outskirts of Constantinople by March 1453. The seven-week siege began on the 6th of April 1453. On the 29th of May, the city fell. Mehmed entered through the Gate of Charisius and rode to Hagia Sophia, ordering it converted into a mosque. Around 33,000 people were captured after the conquest. The population had fallen so far that Mehmed found 30 abandoned neighborhoods, which he was forced to resettle with people moved from other conquered territories. Gennadios Scholarios, Patriarch of Constantinople from 1454 to 1464, described what had once been called "the city of wisdom" as having become "the city of ruins."

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• 7. Culture, Learning, and Trade

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  From the mid-5th century to the early 13th century, Constantinople was the largest and wealthiest city in Europe. The Book of the Eparch, dating to the 10th century, gives a picture of tightly organized commercial life: tradesmen were organized into guilds supervised by the Eparch, who regulated prices, imports, and exports, with each guild holding its own monopoly. Ibn Battuta, who visited in 1325, wrote of bazaars in which the majority of artisans and sellers were women. An earlier record noted that Procopius claimed more than 500 people did business along the Mese street market during the age of Justinian. The city's libraries preserved manuscripts of Greek and Latin authors through centuries when instability destroyed them elsewhere in Europe and North Africa. When Constantinople fell in 1453, thousands of those manuscripts were carried by refugees to Italy, where they played a role in stimulating the Renaissance. A 16th-century Chinese geographical treatise recorded that translators lived in the city, indicating its multilingual character. Constantinople was home to the first known Western Armenian journal published and edited by a woman: Elpis Kesaratsian's Kit'arr, which entered circulation in 1862 and stayed in print for seven months. The city's gold coinage, the solidus introduced by Diocletian and known in the Middle Ages as the bezant, was the only sound gold currency in Europe until the 13th-century Italian florin.

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• 8. Becoming Istanbul

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  The modern Turkish name İstanbul derives from the Greek phrase eis tin Polin, meaning "to the city." That colloquial name had coexisted with the formal Ottoman Kostantiniyye throughout centuries of Ottoman rule. Allied forces entered Constantinople in November 1918 after the empire's defeat in the First World War and maintained an occupation that formally lasted until 1923. The abolition of the Ottoman sultanate in 1922 and the exile of Mehmed VI ended the imperial order that had governed the city for nearly five centuries. The Republic of Turkey was proclaimed on the 29th of October 1923, and the capital was moved to Ankara as part of a deliberate effort to build a new, secular state. In 1928, Turkey formally changed its alphabet from Arabic script to Latin script, and after that the Turkification movement pressed other countries to use Turkish place names. On the 28th of March 1930, Constantinople was officially renamed Istanbul. The Eastern Orthodox Church has never adopted the new name for institutional purposes: their most senior leader is still formally titled "His Most Divine All-Holiness the Archbishop of Constantinople New Rome and Ecumenical Patriarch." In Greece today, the city is still called Konstantinoúpoli or simply "the City." As of December 2025, Istanbul is the most populous city in Europe, with more than 16 million residents straddling the Bosporus strait across both continents.

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