The structure of the central Parthian government depended on "local noblemen" and "clan grandees" and included local autonomous governments based on "aristocracy" and "tribal interests". Ardashir had realized that it would be impossible to pursue and finish the policy of attacking and attaching without permanentizing and consolidating power in his domain; and thus, he could alter the military balance in then status and the homeland structure only by removing the local governors and establishing a central power with an organized bureaucratic system. Although the Sasanian government did not have any difference from the final Parthian era on its first days, but as mentioned, one of the prominent features of the Sasanian era was an increasing inclination toward the concentration of power in Iran since the first days of the Sasanians' uprising. In the Sasanian dawn, Iran included a union of kingdoms and noble landlords (liegemen), each of which possessed a various degree of independence from the central government and were economically connected to it by different channels. In other words, a type of feudal society under the rule of large owners stood in the Iranian Plateau while in the Mesopotamian deserts, the urban culture and pathway cities were the face of society more often.