Factors Influencing the Relationships between Bavandids and Ismailis of Alamut

With the establishment of the Ismaili government in central Alborz in Alamut, a new neighboring power for the local and archaic communities in Mazandaran emerged that affected the regional power and territorial sovereignty of this local dynasty. This article answers the question of what factors influenced the relationship between the two local powers? The results show that the political and religious struggles of  these two governments in the fifth to seventh centuries AH created more relations based on competition and hostility between them. The evolution of relations between these two governments was influenced by different factors and conditions. These factors included the desire to expand or retain territory, ideological and religious differences, the influence of  third powers such as the Seljuks and Mongols, the asylum seeking of the members of  ruling family, and the use of Ismaili opposition killing policy. The present article seeks to highlight these factors using a descriptive-analytical approach to provide a more detailed and coherent perspective on the relationship between these two important regional powers in the fifth to seventh centuries AH.