Abstract
Goshtasp, a Kayanid king and a central figure in the epic and historical tradition of ancient Iran, plays a unique role in linking politics and religion, marking the cultural transition of the Aryan world from legendary-historical monarchism to philosophical-religious governance. This article, through a historical-analytical approach, examines the era of Goshtasp’s reign, the concepts of Farrah Izadi (divine glory), Kherad Aini (ritual wisdom), and the place of Zoroastrianism within the political structure. Goshtasp’s life — from exile to embracing Zoroaster’s teachings and the military victories of his son Esfandiar — exemplifies the interplay of politics, religion, and culture in ancient Iran.