Chahartaq (architecture)
Chartaq (Persian: چارطاق), chahartaq (چهارطاق), chartaqi (چارطاقی), or chahartaqi (چهارطاقی), meaning "having four arches", is an architectural unit consisted of four barrel vaults and a dome. == History == Chartaqi 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 being developed in the Sasanian city of Gor (Firuzabad) in 210s AD by King Ardashir I. The biggest instance of chahartaq is that of the so-called Palace of Shapur I at Bishapur, also in Pars.