The era that preceded the weir rule of Mosul, which could be called the era of the Seljuk rulers, was characterized by general characteristics that made it somewhat different from the Atabakist rule established by Imad al-Din Zangi in Mosul in the year 21 AH. On the surface, it appears that both covenants are complementary to the other, and that the second covenant is a continuation of the previous one in terms of the nature of the relationship with the ruling Seljov Sultan, as the princes in both covenants exercised their administrative duties on behalf of the Seljuk sultans, and in terms of standing strength and weakness in the face of the advancing Crusader danger. But if we carefully examine the nature of the rule in both covenants, we will find a clear disparity between them, whether in their external relations or in their domestic politics.
And the first thing that is noticed in this area. The rulers were in direct contact with the Seljuk Sultan, directing them as he wanted, and isolating them whenever he wanted, even if the matter forced him to use force against the one he spoke to by seeking independence in the areas of his state. He refused direct association with the Sultan. In the Atabak era, the princes of Mosul achieved a great degree of independence and enjoyment of actual power, leaving only the official and formal authority for the Seljuk Sultan, and the most prominent example of this is the stability of the hereditary system in government in the wake of Imad al-Din Zinki, so that the Sultan no longer has any will. In isolating one of them, or issuing his orders for a new lull, to go to Mosul and take over its administration. As was the case before.