The book titled Siyasat-nama which had been written by Nizam al-Mulk, the famous Saljukian vizier, was edited and published on different copies many times upto now and translated into various languages. Within the historical process of the publishing traced back to Charles Schefer, two men are especially worth-noting: Hubert Darke and Mehmet Altay Köymen. This article examines, at first, chronologically the process of publishing the Siyasat-nama and the characteristics of different copies, and lastly attempts to compare the copies of two scholars mentioned above.