Causes of the formation of dioceses Nestorian on the Coasts and Hinterlands of the Northern and Southern of Persian Gulf

The last reign of ancient Iran may be known as the beginning of the formation of Christians colonies in Iran as the population of this religious minority had been added during the Sasanian era by applying some of the policies of the Sasanian court and they had been settled in different part of Iran. Christians efforted to unify and stabilize their position in Iran not only contributed to their participation in various fields such as the economic and social sphere, but also Christians in the shadow of religious tolerance of some Sasanian kings succeeded in establishing churches in Iran. Studying various “written sources” and “archaeological findings” were appeared some Christian colonies which are including the Nestorian dioceses on the coasts and hinterlands of the northern and southern of Persian Gulf in this period such as Rēv Ardašir, Mishān, Kharg Island, Bēt Mazon, Bēt Qatrāyē, Mašmāhig, Sir Baniyas, Darin, Hagar. In this paper the causes of Nestorian dioceses formation have been tried to survey in two parts of Persian Gulf with library study and analytical-descriptive method. The aim of this study is to introduce the Nestorian diocese on the both side of the Persian Gulf and to investigate the causes and fields of their formation on the coasts and hinterlands of the northern and southern of Persian Gulf