Abstract
The key purposes of this article are to articulate the major political ideas and theories developed by Nizam al- Mulk Tusi based on his Magnas Opus entitled SiyasatNamah. It was composed upon the request of Seljuq King Sultan Malik Shah was read thoroughly and met with approval and leading to Malik Shah declaring that it would be the guide to the constitution and law of his state-empire in all affairs. Then, it became the concern of the king - the head of the state to ensure a positive environment for the people to attain peace here and the next and to establish social justice and welfare for each of the subjects in the empire. The name of Nizam al-Mulk might be honoured and respected as one of the greatest political philosophers, administrators, and statesmen who himself theorized the philosophy and enforced that in deed in the development of the polity and the fate of the people.Being an outstanding ruler, he turned himself as the architect, and the most intelligent, the creative and the shrewd administrator - the Grand minister, and the statesmen of the Seljuq Empire for a long tenure of thirty years with most glory and success, developed the state - empire in its heights peak- that made his time of rule the golden age in human history. By studying this research work the readers in general, the students of political science and the teachers of the discipline could globally be acquainted with one of the greatest administrators of the eleventh century world - without whose name the political history of the world remains an incomplete one. No theory is above criticism and his is not so. But if it is analyzed on the prevailed environment in which he lived, would convince us that the theory of his political system was developed upon such of values and ideals that his time or day allowed following and practicing that in full swing. The key aspects of his political system: the essence of the Kingship, the significance of the ministry, the diplomacy - the embassy, the intelligent agents, the un-dividing relationship between Sultanate, state-politics and religion, and the challenges for the state-empire of that day are dealt here with in some extent.