Meanwhile, the power balance in Mesopotamia was gradually changing. While Assyria appeared to be on the rise, with their military tradition, ready to take advantage of the disunited kingdom of Sawad, where the dukes enjoyed large autonomy, the course of history has changed the outcome.
As it happened, Assyria was torn apart by sectarian differences. During a succession crisis, when the eldest son Addai, who has lost his right hand in a hunting accident was challenged by Cephas, who gathered support among the Syriac Orthodox, while Addai was supported by Nestorian Christians.
Thus in the first decade of the ninth century, when the war erupted,the animosities between the two branches, which represented polar opposites in the great christological debate, the conflict was already latent.
In 818 AD thus the realm split, with the Addai securing the Tigris valley, while Khabour was held by Cephas. The large Syriac Orthodox community was persecuted in Tagrit .
The kings of Sawat have gradually managed to extend their authority and press the nobles to answer them. Mesopotamia has managed to remain a center of world research and science. Later historians tried to seek a link between some properties of the Nestoriam religion and the motivation for scholars to do research. Or perhaps it was the historical legacy of the ancient Mesopotamian civilization. Apart from theology and linguistics, which were studied in monasteries, the renowned universities of Sawad cultivated natural sciences, such as geometry, chemistry, mathematics and philosophy.
By the mid-ninth century, the Beth Qatriye has culturally become so much connected to Sawad, that when king Giwarkis set on a brief campaign to subdue the area, in 846, he met little resistance. The area was predominantly Nestorian and Aramaic-speaking, with a significant Manichean presence.
Further west, the Ghassanids, who were in steady decline, were confronted by the Rhomaic reconquista, when they forced to pay trivute in 811, and then again in 837, when they lost the Orontes valley, and were redeuced to the region of Damascus .
The city of Beroia, or Aleppo, independent for over a century, placed itself under the suzerainty of the Rhomaic empire after the brisk victory of the Rhomaic empire over the Ghassanids.
The Ghassanid dynasty in Dmascus was in 843 replaced by a coup by the Yabroudi dynasty, under Sarkis of Yabroud, who was a general.