The role of social capital (the topic of trust) in the collapse of the Sassanid, taking into account the state-specific structure.

An origin of power and legitimating factor of kingdom in the Sassanid era was divine glory, but nature and mortar of this power was according to the will and acceptance of a group of elites including high priests (Mobbedans), military and
bureaucratic aristocracy, and other great ones and nobilities who were of importance and influence as hidden layers of power. At the time of strong and potent kings, this collective power came under of king's individual power, but at the time of other kings, it was this collective power that not only under shadowed king's individual power but also the whole political of Sassanid.  There was always conflict and tension among these layers of power which comprised top classes of the society. Sometimes a presence of common interests caused unanimity and convergence among these classes, but most of the time relationship between these classes was hypertensive, hostile, and based on jealousy, rivalry, criticism and conspiracy, and intrigue. On the other hand, since the kings saw their influence, ruling and supremacy in danger, they always looked at them with fear, caution combined with pessimism, meanwhile according to centralized policy in Sassanid era the king should by acting as chief of high layers of society to have them under his and supervision and establish balance of power among them, and in order to protect and stabilize the monarchy's ruling and power, should establish a proper relationship with them,  and by supporting Zarathustra religious apparatus against minorities and protecting priests' rational interests made the religious apparatus support structure of government and legitimacy of Sassanid dynasty. However, from the second half of Sassanid ruling, this relationship becomes disturbed, and the social order faces crisis; crisis of legitimacy, management, strife and quarreling,  rivalry, treason, suspicion, conspiracy, coup d'état and insurgency, abuse of
privileges and power, bigotry, violence, and greed of authorities which as a result of distrust or lapse of confidence as the most important pillar of social capital, confront the whole set with inability and inefficiency in composing or observance of organizational principles and structural ، and by ruling of such circumstances, the connections are completely ruined and Sassanid regime breaks down.