The position of Qazi al-Qadat in the Abbasid era ( Looking at the position of Mobad Mobadan during the Sasanian period )

With the Sassanids coming to the fore and applying the new policy of unity of religion and government for the first time in Iran, Zoroastrian clerics became important not only in religious matters but also in the administration of state and army affairs. He was the highest-ranking Zoroastrian cleric in the Sassanid era of chaplains, and in addition to addressing religious issues, he also dealt with legal and political issues. One of the most important and, of course, the most sensitive functions of chaplains in this era, as the intellectual representative of the Sassanid government, was to institutionalize the policy of the integration of religion and state into the state and society, as well as to legitimize the Sassanid religious state.Grand judge in the Abbasid era, like the chaplain of the Sassanid era, exerted influence in politics and society.Grand judge in the Abbasid era had the same function as chaplains in the Sassanid era in establishing stability and security in the Abbasid realm, as well as establishing justice and resolving disputes.This article asks the main question:Was there a relation between the position and function of the chaplains of the Sassanid era and the grand judge of the Abbasid era? Explores the function and position of grand judge in the Abbasid era. The achievement of the research indicates that grand judge had an important place in the Abbasid era not only in judicial affairs but also in political and administrative matters, but his most important function was to legitimize the Abbasid caliphate against religious differences and votes