Abstract

Despite the frequent attacks of Nomad tribes of the northern plains, the demographic composition of Transoxiana had remained Iranian in ancient era; nevertheless, after Muslim Arabs prevalence until the Mongol invasion, the demographic composition of this area completely changed under the influence of different factors. In addition to identifying the demographic composition of Transoxiana in the first Islamic centuries, this study is intended to introduce the factors affecting the transformation of the demographic change of this area. This study shows that in the Early Islamic centuries, the political structure and ethnic-racial of Transoxiana changed under the influence of different factors as Arab Conquests, Geographical Location of Transoxiana, Refuge of the opponents of caliphs, Commerce, Ghaza, The Religious Importance and Prosperity of Scientific Schools, Political Centralization in the Region by the Samanids, conversion of Turk Nomads to Islam, Migration of Turk Tribes to the region and Migration of that Inhabitants.

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