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Pre-Islamic Sassanid society was immensely complex, with separate systems of social organisation governing numerous different groups within the empire.[1] Historians believe society comprised four[2][3][4] social classes, which linguistic analysis indicates may have been referred to collectively as "pistras".[5] The classes, from highest to lowest status, were priests (Asravan), warriors (Arteshtaran), secretaries (Dabiran), and commoners (Vastryoshan).[citation needed]