About ancient Iran, especially in recent years, considerable research has been done and it showed auspicious event that for researchers ancient Iran is significant. Article is due to the focused attention of the political aspects of civilization, the kind of work is original. The main question has been written that, Continuity of government and rulers for their statesmanship, and what evidence and evidences is presented ? Response based on the analysis of texts in the inscriptions has obtained evidence that the political legitimacy to justify three elements are of greatest importance. These elements include: Ancestry, God kindness, justice and human special-virtues. In this study, western inscriptions of Iran (current) have been studied.