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Chartaq (Persian: چارطاق), chahartaq (چهارطاق), chartaqi (چارطاقی), or chahartaqi (چهارطاقی), literally meaning "four arches", is an architectural unit consisted of four barrel vaults and a dome. It was a prominent element in Iranian architecture, having various functions and used in both secular and religious contexts for 1,500 years, with the first instance apparently being developed in Gor (Firuzabad), Pars, in 210s AD by Ardashir I. The biggest instance of chahartaq is that of the so-called Palace of Shapur I at Bishapur. Many pre-Islamic chahartaqs have been survived, but they are usually just the sole surviving structure of a much bigger complex. The structure was adopted in Islamic architecture of Persia.
A related concept is čahārqāpū (چهارقاپو).
Chahartaq in Sarab, East Azerbaijan Province. Sassanian period
Chartaqi of Karchan
Chahartaqi of Konarsiyah
Saint Gregory the Illuminator Cathedral, Yerevan, Armenia