PART 3: The course of the Eastern Roman Empire
The Eastern Roman Empire presents a different tale to that of the West. When Constantine moved the capital to Byzantium, much of the relative power moved with him, and the west floundered considerably. Where the Western half had lost all credibility through intrigue and capitulation, the East maintained a unified outward appearance and continued to champion the imperial cause. The Empire had been reunited only a couple of times, perhaps most notably by Justinian, who went so far as to reclaim Rome itself. Though virtually all of Europe had been abandoned, his gains in the east were the most extensive that the Roman empire had seen. Rome was, of course, lost once more in the mid 8th century to the Lombards and Germanics. The pre-Islamic Sasanid Empire was the greatest direct threat to Byzantium, and after Constantine's conversion they actively persecuted all Christians in their territory. Confusingly, the zoroastrian Sasanids were amicable towards the Jews who still held to their pharisaic interpretation of the Old Testament. The Sasanids were wiped out by Islam almost immediately after its conception, and the waylaying of Christian lands became the highest priority target for the next 1400 years of jihad. As Islam slashed its way across North Africa, deleting all records of the world that came before, the city of Constantine stood as an impenetrable bulwark against it. It was besieged multiple times, but only ransacked twice - once by self-styled Crusaders, and finally by the Ottomans. The Fourth Crusade of the early 1200s is popularly regarded as the beginning of the end for Byzantium, but was less of a conscious act of invasion by Western Crusaders and more an unfortunate series of selfish accidents. Prior to the Fourth Crusade the Romans had easily kept Islam at bay, despite a lack of support and sometimes outright hostility from Europe. Regardless of the cause, the power of the empire was strained by these events.
Constantinople was recognised as the greatest treasure in the world, and its heritage of beauty and knowledge was vast and ancient - its library contained texts from the Library of Alexandria. This was destroyed by the Ottoman invaders, but our modern-day knowledge of classical Greek literature is owed entirely to the Eastern Roman Empire. Finally, in 1453, the strength of the East gave way. Barely 10,000 men held out against hundreds of thousands under the command of the Turkish Sultan, and as the ancient walls of Theodosius fell under cannon fire, no help was forthcoming from the west. During the siege, ancient relics were melted down into coins to pay mercenaries, and during the plunder that followed the Muslim forces left no quarter. It is said that a fog enshrouded the city during the siege, and as it lifted, a strange light was seen departing from the Hagia Sophia. The legends claim it was the Holy Spirit leaving the city. The Emperor Constantine XI removed his Imperial vestments and lead his men in a final charge. His body was never found, and is said to be enshrined in marble until the day Christendom needs him once more. The rape of Constantinople may be the greatest crime in the history of the middle ages. The victorious Sultan declared himself Kayser-i Rum, Caesar of Rome, but this adoption was not respected by any. The true Caesar lived on in the halls of the Orthodox Church, and the descendants of Byzantine royalty moved with it into Russia.
Russia had its own history similar to that of pre-Roman Europe, but with the added influence of raiding Asiatic warlords. Various kingdoms rose and fell with the ages, but in the 15th century, a prophecy was given to Ivan III stating that his kingdom would become the Third Rome. After the fall of the Byzantine incarnation of the Roman Empire, Ivan cleared the field of contenders and named his empire the Tsardom of Russia, with himself as the Tsar. Sometimes Anglicised as Czar, it is a transliteration of Caesar, and just like the emperors of Byzantium, all subsequent Tsars had the theological weight of the Orthodox Church behind them. The course of the Russian Roman Empire was relatively smooth, similar to the Byzantine one before it, and had a fiery distate for Islamic pretension. The East never reclaimed Constantinople, now called Istanbul, as the last Tsar had been overthrown by the Communists in 1917.