Investigating the Factors Effective in the Economic Development of Neishabur in Time of Tahirid

Tahirid (207-250 A.H) are the first government in Iran during the Islamic period, who could revive the Iranian thought and identity based on the Islamic instructions. Although Taherids were dependent on the Abbasid caliphate, they were able to gain relative independence during the rule of Abdullah bin Tahir (213-230 A. H), in Nishabur as their capital. This event was due to several factors, including the reforms in favor of the governance and the conquest of the Khawarij, followed by the economic development of Neishabur. The main purpose of this article is to investigate the factors influencing the economic prosperity of Neishabur in Tahirid era, especially during the rule of Abdullah bin Taher.This research, done through the  descriptive-analytical method, seeks to answer the question on how Tahirid have influenced the economic prosperity of Neishabur. The findings of the research illustrate that the special attention of Tahirid to the agriculture, irrigation method, systematic tax and the growth of other industries has led to the development of commerce.