 With its use came the development of many other architectural devices, previously put to the test in scattered buildings and then called into service to meet the structural, aesthetic and ideological needs of the new style.These include the flying buttresses, pinnacles and traceried windows which typify Gothic ecclesiastical architecture.The pointed arch, one of the defining attributes of Gothic, appears in Late Roman Byzantine architecture and the Sasanian architecture of Iran during late antiquity, although the form had been used earlier, as in the possibly 1st century AD Temple of Bel, Dura Europos in Roman Mesopotamia.