June 29, 626 – Avars Storm Constantinople

Following the fall of Rome to the Visigoths, Constantinople took up the mantle of Roman Empire and again established rule through the Mediterranean under the emperor Justinian (527-565). Such a massive empire again proved unwieldy, and Justinian had to install massive bureaucracy to achieve the continuation of his empire. While maintaining order, the bureaucracy was also incredibly expensive, which ironically created unrest as the populace grew weary of heavy taxes despite the wealth of empire. Emperor Maurice (582-602) created cost-saving measures whenever possible, such as refusing in 598 to pay ransom to the Avar Khaganate for thousands of Byzantine prisoners-of-war. The result was the soldiers being slaughtered, but the coffers of the Empire remaining full. In 602 as another measure, he ordered the army to make winter quarters on the frontier north of the Danube rather than march home. This action caused the army to rebel and march on Constantinople, dragging Maurice out of sanctuary in a monastery to execute him. Their leader Phocas was installed the new emperor.

Although popular, Phocas proved unable to defend the empire. In the north, the Avars and their Slavic allies overwhelmed the Balkan territories. In the east, Governor Narses of Mesopotamia incited a rebellion against Phocas' rule. When Phocas sent an army to put him down, Narses sought aid from Khosrau II, emperor of the Sassanid Persians, who was pleased to attack the weakened Byzantines. The Persians defeated the Byzantine army sent against them and began conquering through Armenia and Asia Minor. In 610, Heraclius, the Exarch (“regional governor”) of Africa, overthrew the now very unpopular Phocas and tried to make peace. The Persians denied him and continued conquering the Levant and Egypt. Heraclius assembled expeditionary forces to counterattack in northern Asia Minor and then left Constantinople in 624 to campaign in the Caucasus.

The Avars continued their sweep across the Balkans to the capital itself with some eighty thousand men and siege equipment with the goal of wiping out the Byzantines altogether. An army twelve thousand strong and featuring cavalry defended the city, but it was the bureaucracy who managed life there. A bureaucrat named John determined that food the coming siege was of crucial value and began work to maintain the bread supply. He moved to cancel the free bread ration for the imperial guard (who had ample money of their own to spend) and enacted that overall bread prices be increased from three to eight folles to ensure none was wasted. On May 14 and 15, people gathered at the Great Church and chanted in protest. The local governing body under Bonos discussed what to do and ultimately decided that austerity must be retained in the face of the oncoming barbarians. After days of protest, the government sent loyal soldiers to chase away the chanters. Rioting began, and soon the city was set aflame. Order was restored at times, but the populace proved unresponsive even to zealous religious appeals. In the end, most of the citizenry abandoned the city and fled by sea in convoys to avoid attack Persians. City bureaucrats attempted to stop the retreat with control of the sea walls, but defenses were sabotaged by the people hoping to escape.

When the Avars arrived on June 29, few soldiers were left loyal to Byzantium. A short battle followed, and, despite superior defensive technology with its walls, the Avars broke into Constantinople. Barbarians looted what remained of the city and burned the rest, ending what had been a key position of trade in the known world. Heraclius found himself without a capital, and his allies lost all confidence. He began an overall evacuation to Africa and established himself there, though the empire continued to crumble with Visigoths seizing lands to the west in Spain. The Persians and the Avars reached agreement on a border along the Hellespont, giving both access to trade there while making it a dangerous haven for pirates on the newly unprotected strait.

Although victorious over their Byzantine rival, the Sassanids soon found themselves overwhelmed by the Arab Empire that grew up following the spread of Islam in the 630s and 640s. It eclipsed Zoroastrianism and spread through Africa to Spain, India, and northward to become the principal religion of the Huns and Rus. Charlemagne maintained Christendom in central Europe, and the Scandinavian nations joined as well. Western Europe continued as a marginal corner of the world with trade centering on the vast holdings of the Caliphates. Eventually European explorers seeking a westward route around the Muslim monopoly discovered the New World, which brought a new age of empire upon the out-of-the-way continent.

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In reality, the government removed John (who earned the name “Seismos” or “Earthquake”) and instead worked to reinforce the spirit of the Constantinopolitans to stand against the heathen hordes. After a short siege that summer, the Avars “lacked the technology and the patience to take the city” (Walter Kaegi) and gave up when they deemed Heraclius' victories divinely inspired. Heraclius defeated the Persians and established Byzantine security, which was reaffirmed by the Crusades against the Turks beginning in 1095. Constantinople would not be conquered until 1453.

May 29, 1453 – Constantinople Siege Raised

On this date, according to the Julian Calendar, the Tenth Crusade, led by united Christian forces directly under Pope Nicholas V gathered from a wide alliance of Venetian, German, and Genoese troops, broke the Ottoman siege at Constantinople. It would serve as the crowning moment of Nicholas’ impressive eight-year term as pope and herald a new age of military security in Christendom from outside threats. Dubbed the time of the “Third Rome”, the triumph would mean the end of the Byzantine period and domination over the European Muslims.

Constantinople grew up from the humble Greek town of Byzantium when Emperor Constantine decided to shift his capital in 330 to escape Roman factions and intrigue as well as establishing quick connection to frontiers where barbarian threats could arise. The Byzantine Empire continued even after the fall of Rome to German invasion and grew wealthy by controlling the key point of trade between the West and East as well as the Bosporus, the only shipping route from the Mediterranean to the Black Sea. Despite centuries of decline since the golden age of Justinian where the Byzantines dominated an empire almost as large as Rome’s had been, Constantinople continued to hang on as a crucial lynchpin of world trade and civilization.

Meanwhile, the world changed around stagnant Constantinople. The Orthodox Church broke with the western Rome due to differences such as the veneration of icons and, especially, attacks such as the sacking of the Church of Holy Wisdom in 1204 during the Fourth Crusade. The Byzantines lost control of Anatolia, which broke into various principalities, one of which was ruled by Osman I in 1299, who held a vision of an empire as a tree with roots spreading through three continents and leaves blotting out the sky. He defeated the Byzantines at Bapheus in 1302, which was the first display of the quick expansion of the Ottomans through Anatolia and then, under Mehmed I, into the Balkans (1413-1421). Though the growing Ottoman Empire was just a few miles from Constantinople, it would be more than a century before they could muster enough force to conquer the city, merely demand tribute. Upon taking the Ottoman throne in 1451 at age nineteen, Mehmed II immediately set upon building up his navy and preparing to take Constantinople. He finally arranged a force estimated at around 100,000 soldiers with some 320 ships and established a blockade and siege in April of 1453.

Appeals from Constantinople did not go unheard, however. Pope Nicholas V began to call for a crusade for the liberation of the Bosporus from the Ottomans. No king seemed willing to head the expedition, and so Nicholas volunteered himself, using unprecedented powers hinted at in the declarations of Papal supremacy in the Council of Constance in 1418. He still needed armies, which he could gather freely as the Western Schism finally ended with the resignation of Antipope Felix V in 1449. While he would gather great support from Spain, France, and the Italian States, his greatest ally came as Frederick III, King of Germany, whom he crowned emperor of the Holy Roman Empire in 1450, on the condition that he aid in the pope’s new crusade.

Just as the citizens of Constantinople were beginning to give up hope while seeing visions mysterious fogs darkened the city, a total lunar eclipse passed, and St. Elmo’s fire was seen above the Church of Holy Wisdom, the Papal forces arrived. Winning the battle at sea, the crusaders cut off the Ottoman forces, who were in the midst of a final assault on Constantinople. The defenders held part of the city, and the Ottomans attempted to use defenses they had seized against the papal army. Eventually the Ottomans would be overwhelmed, and young Mehmed II would be killed in the fighting, which would rage for months to come as the crusaders stormed the rest of the Ottoman territories.

Rather than set the Byzantines up again, the territories were divided among the conquerors. Venice and Genoa received their outlying islands and sections of Greece while Frederick’s empire expanded over much of the Balkans. Pope Nicholas would die in 1455, but he began the healing of the rift between Rome and Eastern Orthodoxy, which would be completed in a series of councils loosening strict dogma on political grounds. Nicholas’s interest in humanism and the arts would be embraced, widening the Renaissance and establishing a new era of hierarchical unity through the Church, accepting reforms proposed out of Germany through men such as Luther and Calvin.

However, Nicholas’s humanism would be notably prejudice in the religious superiority of Christendom. His expansion of slavery against “Saracens, Pagans and other enemies of Christ wherever they may be found” in the 1452 papal bull was meant originally to encourage conquest by Portuguese in Africa, but the rest of Christendom would seize the opportunity. A new world superpower increasingly centralized through the Holy Roman Empire and Holy League would sweep through the Middle East and North Africa in further crusades, wantonly conquering and eliminating other cultures for centuries until Enlightenment ideals of separating church and state sparked mass revolt.


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In reality, Nicholas V did not work to form his crusade until after the fall of Constantinople. He would never gather the necessary forces before his death, and Mehmed II would establish Constantinople as the new capital of the Ottoman Empire, which would last another four and a half centuries while dominating the eastern Mediterranean.