Sassanian Relief Carvings have utilized the interactions between the king, god, and people to evoke power and represent the social structure of their era through art. This structure, consisting of a grouping of functional identities within the reliefs, presents a form of triple structures found in ancient Indo-European societies, whose format is the common teachings of religions in myths, rituals, and social organizations. This ideology has been introduced as a theory in the field of comparative mythology by Georges Dumézil. This research aims to use Dumézil's comparative mythology method to investigate the reliefs of the Cup of Khosrow Parviz to find the social class functions and, by comparing them, to discover the triple structures. Therefore, the main question of this paper is how Sassanian Relief Carvings represent social actions. The hypothesis is that social actions are represented by the qualities and meanings of the structural elements expressed in the form of roles. The information in this research has been collected through library research, and the organization of the findings is descriptive-analytical. Studies show that the Sassanian society, with its cultural diversity, has commonalities with Indo-European culture, proving the presence of a triple social structure. Signs of this dominant system can be seen in the relief carvings of the Cup of Khosrow Parviz. Thus, the king has appeared in the role of the urban ruler in various situations and places, as well as among other classes of society, embodying qualities that have connected him to the lower social classes (warriors and the masses) through their actions