Introduction: After the overthrow of the Achaemenid government by Alexander and the short-term rule of him and his successors, the Arsacid dynasty rose from the east of Iran. The Arsacid created a just and powerful government, but with all these powers, the Arsacid government, like others, suffered from political immorality, which gradually infiltrated its body and caused its overthrow. Over time, the internal conflicts over the power and the position of the king emptied this strong dynasty from the inside. The present study was formed with the aim of investigating the role of political immorality and power struggle in the decline of the Ashkan people. Material and Methods: This review article was done with a descriptive analytical method and investigated the mentioned topic using the library method. Conclusion: If political ethics is considered in the dimension of public policy, it can be said that according to the belief of many researchers, the Arsacid kings were the most just kings and they were less interested in building palaces and luxurious buildings and more focused on strengthening the economic body and distributing wealth in the society. But if political ethics is considered in the dimension of procedural ethics (or administrative ethics), it can be seen that as a result of trying to gain power under the influence of individual and group resources, a kind of quarrel and conflict was formed in the Arsacid dynasty which was effective in weakening the power of the Arsacid kings.
