page_title: Constantinople
section_title: 337–529: Constantinople during the Barbarian Invasions and the fall of the West
hierarchical_section_title: Constantinople / History / 337–529: Constantinople during the Barbarian Invasions and the fall of the West
context_page_description: Constantinople was the capital city of the Roman Empire, the Byzantine Empire, the brief Crusader state known as the Latin Empire, and the Ottoman Empire.
  With the establishment of the Turkish Republic in 1923, the capital of Turkey was moved to Ankara, and the Greco-Roman name Constantinople was officially changed to Istanbul in 1930, by Mustafa Kemal Atatürk. This was a contraction of an earlier Greek name of the city, "εις την Πόλην". The city is still referred to as Constantinople in Greek-speaking sources. The original city is located in what is now the European side and the core of modern Istanbul.
  In 324, the ancient city of Byzantium was made the new capital of the Roman Empire by Emperor Constantine the Great, after whom it was renamed, and dedicated on 11 May 330. From the mid-5th century to the early 13th century, Constantinople was the largest and wealthiest city in Europe.
context_section_description: The importance of Constantinople increased, but it was gradual. From the death of Constantine in 337 to the accession of Theodosius I, emperors had been resident only in the years 337–338, 347–351, 358–361, 368–369. Its status as a capital was recognized by the appointment of the first known Urban Prefect of the City Honoratus, who held office from 11 December 359 until 361. The urban prefects had concurrent jurisdiction over three provinces each in the adjacent dioceses of Thrace (in which the city was located), Pontus and Asia comparable to the 100-mile extraordinary jurisdiction of the prefect of Rome. The emperor Valens, who hated the city and spent only one year there, nevertheless built the Palace of Hebdomon on the shore of the Propontis near the Golden Gate, probably for use when reviewing troops. All the emperors up to Zeno and Basiliscus were crowned and acclaimed at the Hebdomon. Theodosius I founded the Church of John the Baptist to house the skull of the saint (today preserved at the Topkapı Palace), put up a memorial pillar to himself in the Forum of Taurus, and turned the ruined temple of Aphrodite into a coach house for the Praetorian Prefect; Arcadius built a new forum named after himself on the Mese, near the walls of Constantine.
  After the shock of the Battle of Adrianople in 378, in which the emperor Valens with the flower of the Roman armies was destroyed by the Visigoths within a few days' march, the city looked to its defences, and in 413–414 Theodosius II built the 18-metre (60-foot)-tall triple-wall fortifications, which were not to be breached until the coming of gunpowder. Theodosius also founded a University near the Forum of Taurus, on 27 February 425.
  Uldin, a prince of the Huns, appeared on the Danube about this time and advanced into Thrace, but he was deserted by many of his followers, who joined with the Romans in driving their king back north of the river. Subsequent to this, new walls were built to defend the city and the fleet on the Danube improved.
  After the barbarians overran the Western Roman Empire, Constantinople became the indisputable capital city of the Roman Empire. Emperors were no longer peripatetic between various court capitals and palaces. They remained in their palace in the Great City and sent generals to command their armies. The wealth of the eastern Mediterranean and western Asia flowed into Constantinople.
caption: Theodosius I was the last Roman emperor who ruled over an undivided empire (detail from the Obelisk at the Hippodrome of Constantinople).
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