1. Historical framework
The Fall of 1453 was the result of a long process of disintegration of the Byzantine State and at the same time of the rise of the Ottomans as the dominant ruling power of the region. The Byzantine Empire never recovered to its old splendor after the fall of Constantinople to the Crusaders in 1204. Nevertheless, until the civil war among the members of the Palaiologan dynasty in the middle of the 14th century (1341-1354) it remained a viable political entity with considerable territory and resources. Later on, during the last century of its existence, the Byzantine empire became a loose union of independent lordships (Constantinople, Thessalonica, Moreas etc.) which were governed by members of the imperial family. The dominion of the emperor was confined in Constantinople, the surrounding region, some cities in Propontis and the Thracian seashore of the Black Sea, as well as certain islands. The economic base of the empire was from now on mainly urban, and from many aspects Constantinople during its last century was compared to the Italian city-states. The state revenues were considerably limited and derived mainly from taxes, such as on the selling of wine, from monopolies, as of the salt, and from custom duties.
During the same period the rapid expansion of the Ottoman state took place, as well as its transformation from a little state with tribal base to a multinational empire. Osman’s emirate had been created on the northwestern Asia Minor around 1300, and until 1330 it had enrolled Byzantine Bithynia. The Ottomans came across to Europe for the first time in 1345 as allies of the pretender of the Byzantine throne John Kantakouzenos. After the capture of Kallipolis in 1354, they obtained a firm base in Thrace, from where they could get ferried across and plunder European regions. This possibility gave the Ottomans a huge advantage against all other Turkish emirates of Asia Minor, since they attracted nomad warriors from the Turkish region of the Middle East, which were enchanted by the perspective of the combination of wealthy booty (mainly under the shape of Christian prisoners slaves) and of the holy war against the infidels.
Within a few decades the Ottomans had captured a large part of the Balkans and from 1394 until 1402 they made a first attempt to force Constantinople into surrendering by blockading the city. The defeat of the Turks by Timur (Tamerlane) in the battle of Ancyra (1402) and the subsequent conflicts between the members of the Ottoman dynasty was a relief to Byzantium, but after the rise in power of the sultan Murad II (1421), the Ottoman State recovered and the dominion of the Byzantine emperor was limited again to Constantinople and some maritime cities of Thrace. However, after an unsuccessful attempt in 1422 there was not any other direct assault against Constantinople until 1453. The main restraining factors for the Ottomans were the strong fortifications of the city, the supremacy of the Venetians and the Genoese on the sea and the fear that the engagement of great powers to a siege would encourage attacks from the powers of the Western Christendom (the Crusade of 1444, which ended in the Turkish “Pyrrhic” victory at Varna, had troubled the Ottomans a lot) or uprisings by the various pretenders to the throne.
As far as the Byzantines are concerned, the only perspective of a survival in the long term presupposed the active military aid by the Christian powers. However, the necessary condition for this to happen was the union of the Byzantine Church with the Church of Rome, which deeply divided the Byzantine society. The union was finally agreed during the synod of Ferrara-Florence (1438-1439), but stumbled on the reaction of a large part of the Orthodox flock. The attempt of avoiding an internal crisis probably explains why the patriarchal throne of Constantinople was vacant in 1453,1 as well as why Εmperor Constantine XI was not crowned after his arrival at Constantinople in 1449.
2. Forces and leadership of the opponents
The testimonies on the size of the Ottoman army during the siege are considerably divergent (from 160.000 to 700.000) and, as happens usually with the medieval sources, most of them probably exaggerate with the numbers. Although in the ranks of the tactical Ottoman army and the subordinary forces were certainly added many irregulars with the hope of booty, the total amount must not have surpassed by far that of 200.000 men, and it is highly possible that it was inferior to this number.
There is also divergence regarding the forces of the defenders; however, for them we have the most reliable testimony of Sphrantzes, who had proceeded in counting the troops by order of the Emperor. He reports 4.773 Romans and some 200 foreigners, but the number of the latter ones surely did not include the organized Italian military corps, for which we know from other sources that surpassed the number of 1.000 men and maybe they were around 3.000. In any case, the total number must not have surpassed that of 8.000 men. The besiegers' superiority in numbers was undoubtedly overwhelming.2 Likewise uncertain is the number of the ships of the Ottoman fleet, with a number of 100-150 ships of various types probably being closest to the truth. The ships of the defenders on the Golden Horn were much less, mainly converted merchant ships of the Venetians and the Genoese. Finally, important role in the siege played the canons of the besiegers, of unprecedented size and range. The defenders had also firearms at their disposal, but they were smaller and the defenders were not able to use them properly due to the damages that the vibrations were causing on the walls.
The leadership of the attackers was at the hands of the sultan Mehmed II. Among his inferiors it is worth mentioning the commanders in chief of the European provinces (Rumeli) and of Anatolia, Karadja and Ishak respectively, Zaganos Pasha, Mehmet, Saruja Pasha and Halil, as well as admiral Baltoglu, who was replaced during the siege by Hamza.3
From the defenders' side, under the general commandment of the emperor Constantine XI Dragases,4 the military order had the Genoese Giovanni Giustiniani Longo, whereas various Byzantines and Italians commanded various parts of the walls where they had beeb appointed, including the papal legate Ιsidore and megas doux Loukas Notaras.
3. The course of the events
The capture of Constantinople was Mehmed II's main purpose right after his rise in power, at the end of 1451. During 1452, he built the fortress Boğaz kesen (modern Rumeli Hisarı) on the European shore of Bosporos, in order to control the passage of the Straits, whereas at the same time he began preparations for the siege and the construction of the canons. Already from the fall of 1452 he started seizing Byzantine fortresses outside Constantinople.
Early in April 1453 (gradually from the 4th until the 7th of April 1453) the Ottoman troops were gathered outside Constantinople and on the 12th of April the bombardment of the land walls commenced, as well as the efforts of undermining them. By the time of the final assault, a large part of the walls, especially their middle parts, had suffered heavy damages. On April 18 a first assault against the walls failed. On April 20, after a successful effort of four ships to break the iron ring of the Ottoman fleet and to enter the Golden Horn, the sultan replaced the admiral Baltoglu and, on April 22, he managed to transfer by land part of his fleet in the Golden Horn. The besieged had until then protected the entrance to the Gulf with a chain and with ships arrayed. The entering of the Turkish ships exposed the vulnerable north wall of the city to attacks and forced the defenders to spread even more their already weak forces. Other initiatives of the besieger that impressed his contemporaries was the construction of an armored tower of siege and a floating bridge made with barrels at the creek of the Golden Horn. In spite of the harassment of the walls, two more general charges, one on the 7th and another on the 12th of May, failed. On May 21 the Byzantines turned over the sultan’s proposal to surrender the city on favorable terms. Besides ideological aspects, the emperor’s and his council’s refusal might conceal the hope of the siege being lifted. Rumour of arrival of help from the West was spread in the besiegers’ camp, whereas a group within the sultan’s court from the beginning opposed to the prospect of capturing Constantinople, and they probably passed information to the defenders.
During the final assault, the early hours before the sunrise of the 29th of May, Turkish troops succeeded in penetrating through the walls of the Gate of Saint Romanos area, which had suffered the most serious damages. It can not be estimated if and what role did the alleged penetration of army through the unguarded Kerkoporta play. The resistance of the defenders collapsed when the heavily wounded Giustiniani abandoned the battlefiled, causing panic. A frightful crush between the outer and the inner wall followed, and then the Turks entered the city, exterminating whoever was still resisting. During the phase of the collapse of the resistance at the walls the emperor Constantine was killed as well, although all the details about his last moments do not come from eyewitnesses and they are probably imaginary.
To the conquerors was given the right to sack the city and capture the inhabitants, and most of them were occupied with zeal to this task, allowing a part of the defenders to take refuge to the ships, which afterwards broke the chain of the Golden Horn and escaped. The rest of them were killed or captured; captivity was the fate of the largest part of the people as well. On the 29th of May the Genoese colony of Galata, which until then had kept a neutral position, surrendered to the sultan, whereas Mehmed made a triumphal entrance to Constantinople.
4. The day after the Fall
The main general dilemma that the conqueror sultan faced after the Fall was that of the break with- or the continuation of the Byzantine legacy of Constantinople. His attitude toward some members of the old ruling class is characteristic, such as with megas doux Loukas Notaras, whom the sultan faced favorably in the beginning, but right after he changed his mind and ordered his execution.5 On the contrary, he appeared tolerant with the Orthodox Christian religion, and six months after the Fall he took the initiative of reestablishing the Ecumenical Patriarchate by choosing as patriarch the anti-Unionist leader Gennadios Scholarios. His most important long term decision was the transfer of the capital to the captured Constantinople, which seems to have been announced in 1458. This decision was followed by an extensive program of resettlement and building, which laid the foundations for the transformation of the ruined city to an ecumenical imperial capital, with a different character and appearance, however, compared to the respective Byzantine one.6
5. The importance of the event
Because of its symbolic aspect, the fall of Constantinople has for a long time been regarded as a hallmark between Middle Ages and Modern era. To estimate its actual wider historical meaning is hard enough, since for the most part this event completed developments that had already taken their course. In the middle term, it considerably contributed to the transformation of the Ottoman state to a powerful imperial power with a clear expansionist orientation and, thus, to a major threat for the European states. In addition, it marked the end of the supremacy of the Italian commercial cities on the trade of the Balkans and the Black Sea. As far as the Christians of the East are concerned, the fall defined the failure of the union of the Churches and the survival of the Orthodox Church as a special entity. At the same time, the church partially took the symbolic place of the Empire as a point of political reference for the Christians, taking simultaneously administrative, financial and juridical responsibilities within the framework of the Ottoman system.