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Taq Kasra ((ペルシア語:طاق كسرى / تاق کسرا / ایوان مدائن), also called Eyvān-e Kasra meaning Iwan of Khosrau), is a Sassanid-era Persian monument located near the modern town of Salman Pak, Iraq. It is the only visible remaining structure of the ancient city of Ctesiphon. The archway is the largest single-span vault of unreinforced brickwork in the world. == History == The exact time of construction is not known with certainty. Construction possibly began during the reign of Khosrau I〔Because of the vicissitudes of historical transmission, ''eventually no less than four Sasanian rulers were quoted as its builders: Shapur I (241–273), Shapur II (310–379), Khosrau I Anushirvan (531–579) and Khosrau II Parvez (590–628).'' 〕 after a campaign against the Byzantines in 540 AD. The arched iwan hall, open on the facade side, was about 37 meters high 26 meters across and 50 meters long, the largest man-made, free standing vault constructed until modern times.〔Wright, G. R. H., ''Ancient building technology'' vol. 3. Leiden, Netherlands. Koninklijke Brill NV. 2009. 237. Print.〕 The arch was part of the imperial palace complex. The throne room—presumably under or behind the arch—was more than 30 m (110 ft) high and covered an area 24 m (80 ft) wide by 48 m (160 ft) long. The top of the arch is about 1 meter thick while the walls at the base are up to 7 meters thick.〔 It is the largest vault ever constructed in the world. The inverse catenary arch was built without centring.〔 In order to make this possible a number of techniques were used.〔 The bricks were laid about 18 degrees from the vertical which allowed them to be partially supported by the rear wall during construction.〔 The quick drying cement used as mortar allowed the fresh bricks to be quickly supported by those that were previously laid.〔 The Taq Kasra is now all that remains above ground of a city that was, for seven centuries—from the 2nd century BC to the 7th century AD—the main capital of the Iranian successor dynasties of the Parthians and Sassanids. The structure left today was the main portico of the audience hall of the Sassanids who maintained the same site chosen by the Parthians and for the same reason, namely proximity to the Roman Empire, whose expansionist aims could be better contained at the point of contact. The structure was captured by the Arabs in AD 637.〔 They then used it as a mosque for a while until the area was gradually abandoned.〔 In 1909 a serious flood demolished the greater part of the edifice. In 1940, Roald Dahl, then undergoing pilot training at RAF Habbaniya near Baghdad〔GOING SOLO by Roald Dahl〕 took an award-winning photograph using a Zeiss camera of the Arch of Ctesiphon in Iraq which was subsequently auctioned by the Dahl family to raise funds for the Roald Dahl Museum and Story Centre.〔http://www.e-reading-lib.com/bookreader.php/1010577/Dahl_-_Moi_Boy.html〕 The photo made £6,000. In his autobiography Boy he writes: The monument was in the process of being rebuilt by Saddam Hussein's government in the course of the 1980s, when the fallen northern wing was partially rebuilt. All works, however, stopped after the 1991 Gulf War. The current Iraqi government is cooperating with the University of Chicago's "Diyala Project" to restore the site.〔Diyala Project – http://oi.uchicago.edu/research/projects/diy/#1._Significance_of_Diyala_Excavations〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Taq Kasra」の詳細全文を読む スポンサード リンク
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