The concept of expediency is an important and common concept in the history of political thought. Viewing the political legacy remained from ancient Iran and drawing an analogy of which with the literary works remained from the Islamic era, one can perceive that “expediency of the kingdom” is a central concept in the Iranian political thought. Also in the Islamic era and by translation of Iranian works, this concept was reflected in Siyasatnama which resulted in expediency-based politics. Given the history of Iranian political thought, the present article investigates the place and the role of this concept by giving an account of it. The results of the study indicate that in Iranian thought, expediency of the kingdom is not an abstract concept and can be applied to anything that has contributed to the development of the kingdom, spreading of knowledge, increasing the power and credibility and stability of the state.
