Historical Developments in East Iran during the Sassanid Period

Immigrant people who had rushed to the eastern part of Iran since the time of Achaemenian up to the time of Sassanian and then had dwelt there by passage of time played an important role in politics and economical relationships of this 
region. In this article, we will discuss about the process of invasions of these new-comer people from eastern north borders to the Territory of Sassanid Empire. The main goal of this article is to survey and show the manner of cultural relationship and interaction of Sassanid culture and civilization with these people and capacity of culture acceptance with these cultures and tensions or accomplished developments in this mutual confrontation. Several multi dimensional contacts between Iran and its eastern neighbours in most of the cases had been compressed and foreign cultures had interacted and principally the culture that has deeper origin will have more effects in the culture of its opponent. In this time importance of eastern part of Iran was in the extent that this region had become one of the main obsessions of Sassanians and some agents of Sassanid government in Koshan (Koshan Shah) and Sakestan (Sokan Shah). In the absence of any written resources, archaeological findings reflect required informations. From among the most important of these archaeological findings, are Sassanid coins that to some extent determine the governments' territory. These coins were imitated and sampled by the kings of Gajarat, Koshan and Hons. Hons were highly influenced by Sassanid culture and transferred it to India and paved the way for immigration of Zoroastrian Iranian to this region in the later periods.