Power, knowledge and legitimacy in Khajeh Nasir Eldin Tusi's Thought

This article, analyzes three basic concepts (power, knowledge and legitimacy) of Tusi's view-point. Also analyze that what are each of these concepts position in Islamic political thought and finally investigate the dignity of each one. In this research explore Tusi's components political thought, in fact explore the relationship between politics government and in relation with the basic concepts of power and legitimacy. In this article, Tusi's thought examine with two ap-proaches: Analytical-Descriptive and Fuchou's discourses. The knowledge is the main axis of political power and legitimacy, he believes that knowledge and power are two important concepts in government, that governor need them for legitimacy and continuity of his government but within difference that knowledge is pre-examined of all other elements, finally find by ex-amining Tusi's thought. All of his bases knowledge receive from religious lessons and teaching, so we can see political concepts affiliation with religious knowledge in Tusi's government actions