A subject of considerable research in literature is mystics' relationships with kings and the dominant discourse on it. We'll try, in this paper, to survey letter No. 15 from Abdorrahman Jaami, the theosophist and poet in Teymoorid era, to Sultan Hossein Bayqara by the aim of specifying its role and function, dominant style, identifying the most used words of the theme and action as well as the power and ideology of the writer toward the ruling class of the time.The authors of this study, based on situational context, using the descriptive-analytic theory of Norman Fairclough's critical discourse analysis at three levels of description, interpretation and explanation of the questions have tried to answer them. We found that Jaami, in an honorable mystical position, influenced the Sultan and kept him from war and bloodshed and urged him for reconciliation, justice and resort to God's succor. The implied approach of this letter, besides secure the writer's scepter, is reproducing a pan-Islamistic way of governance and abbatial political ideology of Naghshbandyeh religious cult.