Instruct: Given a question, retrieve documents that can help answer the question.
Query: When was Constantinople established?
Constantinople (Greek: Κωνσταντινούπολις, translit.Kōnstantinoúpolis; Latin: Cōnstantīnopolis) was the capital city of the Roman/Byzantine Empire (330–1204 and 1261–1453), and also of the brief Crusader state known as the Latin Empire (1204–1261), until finally falling to the Ottoman Empire (1453–1923). It was reinaugurated in 324 from ancient Byzantium as the new capital of the Roman Empire by Emperor Constantine the Great, after whom it was named, and dedicated on 11 May 330.[5] The city was located in what is now the European side and the core of modern Istanbul.
The event that is often considered to have been the first conflict between Rome and Constantinople was triggered by the elevation of the see of Constantinople to a position of honour, second only to Rome on the grounds that, as capital of the eastern Roman empire, it was now the "New Rome". This was promulgated in the First Council of Constantinople (381) canon 3 which decreed: "The Bishop of Constantinople, however, shall have the prerogative of honour after the Bishop of Rome because Constantinople is New Rome." It has been asserted by many that the Council of Rome, a synod held by Pope Damasus I in the following year, 382, protested against this raising of the bishop of the new imperial capital, just fifty years old, to a status higher than that of the bishops of Alexandria and Antioch, and stated that the primacy of the Roman see was established by no gathering of bishops but by Christ himself. Thomas Shahan says that, according to Photius too, Pope Damasus approved the council of Constantinople, but he adds that, if any part of the council were approved by this pope, it could have been only its revision of the Nicene Creed, as was the case also when Gregory the Great recognized it as one of the four general councils, but only in its dogmatic utterances. In Catholic doctrine, no council, regardless of who summoned it or who presided over it, is ecumenical unless it is confirmed or at least recognized as such by the pope.
In April 1204, Constantinople fell to the soldiers of the Fourth Crusade, and like many Byzantine leaders, Theodore fled the city and sought refuge in Asia Minor. There Theodore was tonsured as a monk. In 1209, the newly proclaimed Nicaean emperor, Theodore I Laskaris, named him to the post of "chartophylax" of the Patriarchate of Constantinople, re-established in Nicaean exile. Laskaris also awarded him with the title "hypatos ton philosophon", a prestigious title given to the head of the faculty of philosophy in Constantinople.
The siege and sack of Constantinople occurred in April 1204 and marked the culmination of the Fourth Crusade. Mutinous Crusader armies captured, looted, and destroyed parts of Constantinople, the capital of the Byzantine Empire. After the capture of the city, the Latin Empire (known to the Byzantines as the "Frankokratia" or the Latin Occupation) was established and Baldwin of Flanders was crowned Emperor Baldwin I of Constantinople in the Hagia Sophia.
Established on 20 April 1926 by Greek Constantinopolitans who fled to Thessaloniki from the city of Constantinople (present-day Constantinople) in the wake of the Greco-Turkish War, they play their home games at Toumba Stadium, with a capacity of 28,701 seats. Their name, along with the club's emblem, the Byzantine-style double-headed eagle with retracted wings that was adopted three years after the establishment of the club, honours the memory of the people and places (mostly the city of Constantinople) that once belonged to the Byzantine Empire and were Fall of Constantinople invaded and conquered by the Ottoman Empire in 1453. Τhe club is one of the founding members of the Hellenic Football Federation that was formed in 1926.
The list of Armenian Patriarchs of Constantinople presents the holders of the office of Armenian Patriarch of Constantinople, the head of the Armenian Patriarchate of Constantinople from its establishment in 1461 to the present day.
When the Byzantine Empire was divided among the conquerors of the Fourth Crusade, the Republic of Venice took her share, three eighths of the whole, as the Greek islands, Kythira among them. She established a coast patrol on Kythira and Antikythera to protect her trade route to Constantinople; Kythira was one of the islands Venice continued to hold despite the Greek reconquest of Constantinople and the Turkish presence all over the Near East. During the Venetian domination the island was known as Cerigo. 
After conquering Constantinople, the Ottoman Empire allowed the Greek Orthodox Patriarchate of Constantinople to stay in the city. But Sultan Mehmed II asked the Armenians to establish their own church in the new Ottoman capital, as part of the Millet system. From then on the Armenian Patriarchate of Constantinople acted as superior religious institution in the Ottoman Empire, even standing over the Armenian Catholicos. For a short period, the Syriac Orthodox Church was also placed under the jurisdiction of the Armenian Patriarchate.
Hagia Sophia (from the , "Holy Wisdom"; or "Sancta Sapientia"; ) is a former Orthodox patriarchal basilica, later a mosque, and now a museum in Istanbul, Turkey. From the date of its dedication in 360 until 1453, it served as the Greek Patriarchal cathedral of Constantinople, except between 1204 and 1261, when it was converted to a Roman Catholic cathedral under the Latin Patriarch of Constantinople of the Western Crusader established Latin Empire. In 1453, Constantinople was conquered by the Ottoman Turks under Sultan Mehmed II, who subsequently ordered the building converted into a mosque. The bells, altar, iconostasis, and sacrificial vessels were removed and many of the mosaics were plastered over. Islamic features – such as the mihrab, minbar, and four minarets – were added while in the possession of the Ottomans. The building was a mosque from 29 May 1453 until 1931, when it was secularised. It was opened as a museum on 1 February 1935.
The final centuries of the Empire exhibited a general trend of decline. It struggled to recover during the 12th century, but was delivered a mortal blow during the Fourth Crusade, when Constantinople was sacked and the Empire dissolved and divided into competing Byzantine Greek and Latin realms. Despite the eventual recovery of Constantinople and re-establishment of the Empire in 1261, Byzantium remained only one of several small rival states in the area for the final two centuries of its existence. Its remaining territories were progressively annexed by the Ottomans over the 15th century. The Fall of Constantinople to the Ottoman Empire in 1453 finally ended the Roman Empire.
Constantinople had been an imperial capital since its consecration in 330 under Roman Emperor, Constantine the Great. In the following eleven centuries, the city had been besieged many times but was captured only once: during the Fourth Crusade in 1204. The crusaders established an unstable Latin state in and around Constantinople while the remaining empire splintered into a number of Byzantine successor states, notably Nicaea, Epirus and Trebizond. They fought as allies against the Latin establishments, but also fought among themselves for the Byzantine throne.
The Sultanate of Rum was in chaos and decentralized ever since the Mongol invasions in ca. 1240.[7] As a result, the greatest threat to Byzantium was not the Muslims but their Christian counterparts in the West — Michael VIII knew that the Venetians and the Franks would no doubt launch another attempt to establish Latin rule in Constantinople. The situation became worse when Charles of Anjou, brother of the King of France, conquered Sicily from the Hohenstaufens in 1266.[8] In 1267, Pope Clement IV arranged a pact, whereby Charles would receive land in the East in return for assisting a new military expedition to Constantinople.[8] A delay on Charles' end meant that Michael VIII was given enough time to negotiate a union between the Church of Rome and that of Constantinople in 1274, thus removing Papal support for an invasion of Constantinople.
In August, Ottoman forces established a provisional government of Western Thrace at Komotini to pressure Bulgaria to make peace. Bulgaria sent a three-man delegation—General Mihail Savov and the diplomats Andrei Toshev and Grigor Nachovich—to Constantinople to negotiate a peace on 6 September. The Ottoman delegation was led by Foreign Minister Mehmed Talat Bey, assisted by future Naval Minister Çürüksulu Mahmud Pasha and Halil Bey. Although Russia tried to intervene throughout August to prevent Edirne from becoming Turkish again, Toshev told the Ottomans at Constantinople that "[t]he Russians consider Constantinople their natural inheritance. Their main concern is that when Constantinople falls into their hands it shall have the largest possible hinterland. If Adrianople is in the possession of the Turks, they shall get it too."
The new seat of the Patriarchate was established in the city of Nicaea until in 1261, when Constantinople was reconquered by the Byzantine Emperor Michael VIII Palaiologos.
The final breach between Greeks and Latins is often considered to have arisen after the capture and sacking of Constantinople by the Fourth Crusade in 1204. Crusades against Orthodox Christians by Roman Catholic crusaders were not exclusive to this crusade nor the Mediterranean. The sacking of Constantinople and the Church of Holy Wisdom, the destruction of the Monastery of Stoudios, Library of Constantinople and the establishment of the Latin Empire in Constantinople and also throughout West Asia Minor and Greece (see the Kingdom of Thessalonica, Kingdom of Cyprus) are considered definitive though. This is in light of Roman Catholic atrocities not exclusive to the capital city of Constantinople in 1204 starting the period in Greece referred to as Frangokratia. The establishment of the Latin Empire in 1204 was intended to supplant the Orthodox Byzantine Empire. This is symbolized by many Orthodox churches being converted into Roman Catholic properties and churches like Hagia Sophia and Church of the Pantokrator, and it is viewed with some rancor to the present day. Some of the European Christian community actively endorsed the attacking of Orthodox Christians.
However, the power of the patriarch of Constantinople continued to grow. Eastern Orthodox state that the 28th canon of the Council of Chalcedon (451) explicitly proclaimed the equality of the Bishops of Rome and Constantinople, and that it established the highest court of ecclesiastical appeal in Constantinople. The patriarch of the imperial capital succeeded in his efforts to become the leading bishop in the Byzantine Empire: he "headed a vast curia and other bishops who resided in Constantinople constituted a permanent synod, which became the real governing body of the church".
The first Armenian Patriarch of Constantinople was Hovakim I, who was at the time the Metropolitan of Bursa. In 1461, he was brought to Constantinople by Sultan Mehmed II and established as the Armenian Patriarch of Constantinople. Hovakim I was recognized as the religious and secular leader of all Armenians in the Ottoman Empire, and carried the title of "milletbaşı" or ethnarch as well as patriarch.
The East Roman or Byzantine Empire established and operated several mints throughout its history (330–1453). Aside from the main metropolitan mint in the capital, Constantinople, a varying number of provincial mints were also established in other urban centres, especially during the 6th century. Most provincial mints except for Syracuse were closed or lost to invasions by the mid-7th century. After the loss of Syracuse in 878, Constantinople became the sole mint for gold and silver coinage until the late 11th century, when major provincial mints began to re-appear. Many mints, both imperial and, as the Byzantine world fragmented, belonging to autonomous local rulers, were operated in the 12th to 14th centuries. Constantinople and Trebizond, the seat of the independent Empire of Trebizond (1204–1461), survived until their conquest by the Ottoman Turks in the mid-15th century.
After the Sack of Constantinople in 1204 AD by Roman Catholic Crusaders as part of the fourth crusade, much of Asia Minor was brought under Roman Catholic rule and the Latin Empire of the East was established. As the conquest by the European crusaders was not exclusive to the fourth crusade, many various kingdoms of European rule were established. After the fall of Constantinople to the Latin West, the Empire of Nicaea was established, which was later to be the origin of the Greek monarchy that defeated the Latin forces of Europe and re-established Orthodox Monarchy in Constantinople and Asia Minor.
Despite orders of the Pope not to attack Constantinople, The crusaders had sacked the City in 1204. After this, They established a Latin Empire, Centered on Constantinople. 
Constantinople was a holy city and the Nicaeans sought to retake it in order to legitimize their successorship to the Byzantine empire.
The death of Lazaros deprived the community of much of its prestige, but it re-emerged into prominence in the 13th century, with the establishment of the Empire of Nicaea, when the neighbouring city of Nymphaion became the favourite winter residence of the Nicaean emperors. The patriarchs Joseph I of Constantinople (1266–1275 and from 1282–1283), Gregory II of Constantinople (1283–1289) and Athanasius I of Constantinople (1289–1293 and 1303–1309) were all monks of the "monastery of Galesios"; Gregory II even wrote a new version of the hagiography of St. Lazaros. The monastery featured a considerable library and a scriptorium.
The Latin Patriarchate of Constantinople was an office established as a result of the Fourth Crusade and its conquest of Constantinople in 1204. It was a Roman Catholic replacement for the Eastern Orthodox Ecumenical Patriarchate of Constantinople, and remained in the city until the reconquest of Constantinople by the Byzantines in 1261, whereupon it became a titular see. The office was finally abolished in 1964.
The earliest mail service between St Petersburg and Constantinople consisted of diplomatic pouches carried from 1721 on. The Treaty of Küçük Kaynarca in 1774 provided for a regular mail service, for which a consular post office was established in Constantinople. It began using handstamped postal markings around 1830. Beginning in 1779 a mail boat circulated between Constantinople and Kherson, and 1781 saw the establishment of an overland route through Bucharest to Bratzlav.
Constantinople became established in the ecclesiastical hierarchy at the Council of Constantinople in 381. Second only to Rome, the legendary origins of the Patriarchate of Constantinople go back to St. Andrew, Metrophanes and Alexander of Constantinople. Constantinople's primacy over the Patriarchates of Alexandria and Antioch was reaffirmed at the Council of Chalcedon in 481, after which the papacy in Rome supported Constantinople in its dispute with Alexandria over monophysitism. Later, when Rome sought to assert its primacy over Byzantium, the Eastern Orthodox church developed the doctrine of pentarchy as a response.
After the Sack of Constantinople, much of Asia Minor was brought under Roman Catholic rule, and the Latin Empire of the East was established. As the conquest by the European crusaders was not exclusive to the fourth crusade, many various kingdoms of European rule were established. After the fall of Constantinople to the Latin West the Empire of Nicaea was established, which was later to be origin of the Greek monarchy that defeated the Latin forces of Europe and re-established Orthodox Monarchy in Constantiople and Asia Minor.