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by the barrel-vaulted iwans introduced in the Parthian era, but now they reached massive proportions, particularly at Ctesiphon. The arch of the great vaulted hall at Ctesiphon, attributed to the reign of Shapur I has a span of more than 80 ft, and reaches a height of 118 ft. from the ground. This magnificent structure fascinated architects in the centuries that followed and has always been considered one of the most important pieces

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