Immigration of Arab tribes from Irak to Khurasan in the period of Ziyad's Regime

During Umayyad time, a few immigrations occurred from Irak to khurasan in virtue of intending to the economic and military purposes. Ziyad's regime leaded two early immigrations from Irak in his era. The first immigration was done from Basra to Khurasan in667 A.D/47h, and was related to the Arab's military deadlock in Khurasan and tribal revolts which were arisen by distributing the Ataya in Basra. The second one happened in 671 A.D/51. At that time, 50000 families of the tribes of kufa and Basra were migrated to Khurasan. This one was related to the tribal revolts of Khurasan and the Arab's military problems in east [of Islamic territory]. It is significant to study and know the roles of these immigrations, not only on controlling the revolts of Irak and decreasing the Arab's military problems in khurasan, but also recognizing the matters as: (1) Umayyad's new policy in borders. (2) The situation of Khurasan and Irak at that time.(3) The Arab's military status In Khurasan; and (4) The significance of Khurasan for the Arabs. Here, I intend, ascribing to some important resources and studies, to study the influence of this two immigrations on controlling the revolts of Irak and improving the Arab's military status in Khurasan.