Administration of the Sassanid Empire was considerably more centralized than that of the Parthian Empire; the semi-independent kingdoms and self-governing city states of the Parthian Empire were replaced with a system of "royal cities" which served as the seats of centrally appointed governors called shahrabs as well as the location of military garrisons.
A administración do Imperio Sasánida era considerablemente máis centralizada que a do Imperio Parto; o sistema de goberno de reinos semi-independentes e cidades-estado independentes do Imperio Parto foi substituído por un sistema de "cidades reais" que servía de sede de gobernadores designados pola administración central chamados "shahrabs" así como tamén de guarnicións militares.