I ran's constitutional revolution and its acceptance by the Autocrat government originated to the events, Believes and social changes occurred in Ghajarid period.This paper attempts to survey this historical change, political arrangement of Iran in Ghajarid period and the legitimacy status of the king in that period.The social attitude and changes in Iran which paved the ways towards forming constitutional revolution has been studied in this paper.This paper also describes the circumstances led to establishing of the first national parliament, along with its activities and dissolution
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