The effect of Iranshahri Thought on Establishing Buyid dynasty Kingdom relying on Tabaristan Historical Geography

Buyid dynasty used Deylam political and social conditions and Tabaristan inhabitants’ intellectual background to establish a new kingdom based on the spirit of warfare and anti-alien. Tabaristan historical geography has influenced the way Buyid dynasty used the idea of "Iranshahri" and "Farah izadi". The main question of the article is what effect did Tabaristan geography have on continuing Iranshahri thought and establishing Buyid dynasty kingdom. This research has used historical-analytical approach and content analysis method and historical sources assessment to recognize Tabaristan position in Iranshahri thought and explain its effects on the success of Buyids to reach the kingdom. It seems that due to Tabaristan background in the political and social system of ancient Iran and its special geographical conditions, people’s thought of this system which tangled with Iransshahri thought of ancient era even centuries after the fall of Sasanian, influenced the establishment of the Buyid dynasty kingdom. This study indicates that Tabaristan geography had made there a secure place to reside. Thus, its rulers had relative independence in the ancient era. This same spirit of independence-seeking and using the background of Iransshahri thought had led to the establishment of the Buyid kingdom with Iranian features after the fall of Sasanian.