The ancient city of Ctesiphon (Also known Tusbun or Taysafun) on the banks of Tigris, in Baghdad established in the late 120s BC. The city is located about 35 kilometers southeast of modern Baghdad actually one of the great cities of late ancient Mesopotamia and the largest city in the world from 570 AD, until its fall in 637 AD. So during the Muslim conquest the only surviving structure of Ctesiphon these days is the majestic vaulted hall of Taq Kasra, which served as the palace of the Sasanian king Khosrow I, in the late 6th century. The archway is one of the biggest single-span vaults of unreinforced brickwork in the world. The exact time of construction is not known with conviction. However, it is believed that construction possibly started during the reign of Khosrau I after a campaign against the Byzantines in 540 AD

Mithradates was founded Ctesiphon, “the King of Parthian Empire” as a royal residence, after he annexed Babylonia by defeating the Greeks. Therefore, under the Parthian rule, Ctesiphon became the political and commercial center of the region, and by the end of 58 BC, it had become the Empire’s capital. Progressively, the city was merged with the old Hellenistic capital of Seleucia and other adjacent settlements to form a cosmopolitan metropolis. Moreover, in the 2nd century, the tug-o-war of power between the Romans and the Parthians affected Ctesiphon to change hands between the two Empires for a total of six times. Though the obliteration of the palace is blamed on different individuals by numerous sources, Abbasid caliph Al-Mansur (754-775) is most usually mentioned.

However, during the last possession, the Romans kick out and looted the city, demolished palaces and carried off thousands of its inhabitants as slaves. Consequently, in 226 AD, the city fell into the hands of the Sasanian Empire, and Ctesiphon prospered once again. The oldest occupied places of Ctesiphon were on its eastern side, which in Arabic sources is named “the Old City”, where the residence of the Sasanians, identified as the White Palace, was located. The southern side of Ctesiphon was recognized as Aspanbar, which was acknowledged by its protuberant halls, riches, games, stables, and baths.

Thus, after another short-lived occupation of the city by the Romans, the Sasanian king Khosrau I recuperated control over Ctesiphon. He then underway building a large palace complex with a large vaulted arch that is 37 meters tall and 26 meters across. The arch top is about one meter thick while the walls at the base are up to seven meters thick. Up to modern times, it was the largest, unverified vault in the world. Besides, after the Arabs took Ctesiphon in 637 AD, they improvised the palace as a mosque until the area was slowly abandoned. Hence, by the end of 8th century, Ctesiphon had been superseded by the lately founded city of Baghdad, and Ctesiphon’s deserted ruins were used as a quarry for building materials. Consequent floods demolished all remaining structures, including Taq Kasra, one third of which was swept away by a flood in 1888.

Henceforth, the striking brick ruin of Taq Kasra is now all that remains above ground of a city that was, for 7 centuries the main capital of the Iranian successor dynasties of the Parthians and Sassanids. In the 1980’s the archway rebuilt process was started by Saddam Hussein’s government when the fallen northern wing was moderately rebuilt. Therefore, all works somehow stopped after the 1991 Gulf War. In 2003, before the US-led invasion the area boasted gardens and arbores, as well as a popular museum. In 2004, the Global Heritage Fund said that, as a result of disrepair, the arch was “in danger of collapse”. Taq-e-Kisra was neglected for a long time and decided to rehabilitate it. However, the current Iraqi government is cooperating with the University of Chicago’s “Diyala Project” to revive its reputation as a tourism hub has proceeded in fits and starts.

Backside view of Taq Kasra from Iraq, Photographic Studies by Oliver F Butler, published in 1922.

Backside view of Taq Kasra from Iraq, Photographic Studies by Oliver F Butler, published in 1922.

Ctesiphon. Iraq 3-anna stamp of 1923

Ctesiphon. Iraq 3-anna stamp of 1923

Mithradates was founded Ctesiphon, “the King of Parthian Empire” as a royal residence, after he annexed Babylonia by defeating the Greeks.

Mithradates was founded Ctesiphon, “the King of Parthian Empire” as a royal residence, after he annexed Babylonia by defeating the Greeks.

Remains of the White Palace at Ctesiphon, Iraq, with the famous Arch of Ctesiphon, taken in 1864, before the collapse of the right-hand façade

Remains of the White Palace at Ctesiphon, Iraq, with the famous Arch of Ctesiphon, taken in 1864, before the collapse of the right-hand façade

Ruins of Ctesiphon (from the United States Library of Congress).

Ruins of Ctesiphon (from the United States Library of Congress).

In the 1980’s the archway rebuilt process was started by Saddam Hussein's government when the fallen northern wing was moderately rebuilt.

In the 1980’s the archway rebuilt process was started by Saddam Hussein’s government when the fallen northern wing was moderately rebuilt.

Muslim conquest the only surviving structure of Ctesiphon these days is the majestic vaulted hall of Taq Kasra, which served as the palace of the Sasanian king Khosrow I, in the late 6th century.

Muslim conquest the only surviving structure of Ctesiphon these days is the majestic vaulted hall of Taq Kasra, which served as the palace of the Sasanian king Khosrow I, in the late 6th century.

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