عنوان مقاله [English]
The Buyid Dynasty, with the nature of the family, commanded a significant portion of the Islamic Territory in the fourth and fifth centuries. The Islamic culture and civilization, although it were at the peak of flourishing in the fourth century, were begining to declined under many factors from the fifth century. Given the conjunction of this case with the political weakness of Buyids, it seems that there is a causal relationship between the two events. By descriptive-analytical method, beside to description of substitution struggles of Buyids, this study seeks to explain its impact on Islamic culture and civilization, and to Answer this question, how did the Buyid’s substitution struggles affect the decline of Islamic culture and civilization, especially rational sciences? The findings of the research show that the Buyid’s succession conflicts led to the decline of the political power of the Buyid's emirs, which in turn led to the weakness of the ministry, the strengthening of the political opponents of the Sultan, the weakening of economic prosperity, the escalation of social insecurity, the spread of sectarian strife and the prevalence of anti-rational currents. These reasons led to the decline of the rational sciences and, consequently, the decline of the Islamic culture and civilization.