Taherian territory governments and the four cities of Khorasan

Khorasan as one of the most important areas of Iran during the pre-Islamic civilization has had a special place. The importance of this land for the Muslims conquered the area was quickly understood. Although the researcher did not wish Abu Tahir al-Hussein, in gaining Khorasan state of Iran in the first state to establish this great land. Taherian in the territory of Khorasan was so widespread that the country was considered a land of Mamun. Among the cities that the village had its own territory Taherian in four cities in the division of Khorasan in the geography of the land and the importance of Islamand has a special place. Merv, Nishapur, Herat and Balkh in Khorasan as four cities in terms of economic, political and cultural rights in their old age Taherian was also considered.