The Reasons for the Joining of Social Classes to Bābak Khurramdin's Revolt against the Abbasids: A Social Study Based on the Theory of Relative Deprivation of Ted Robert Geer

Social movement is a fundamental argument in theories of revolution, and because of this importance, various theories have sought to explain it. One of the most important theories is the theory of relative deprivation. The Siahjamgan uprising sought the support of lower-income groups and relied on them in some of their slogans to raise the level of the value expectations of those social classes, while with the rise of the Abbasids to the caliphate, the level of value ability of the people did not change much. They suffered from frustration and relative deprivation. This situation led to revolt against the Abbasid caliphate, of which Babak Khorramdin's revolt was the most lasting one. The present article tries to investigate the formation and causes of this movement by using the method of historical analysis and sociology in the light of the theory of relative deprivation. The achievement of the article shows that the caliphs and agents of Bani Abbas challenged economic, religious and participatory values and caused relative deprivation, which led to an increase in the participation of social classes to Babak Khorramdin movement.