The Sasanian Empire was greatly weakened when Yazdegerd III ascended the throne. The young king did not have the authority required to bring stability to his extensive empire, which was swiftly falling apart due to ceaseless internal conflicts between the army commanders, courtiers, and powerful members of the aristocracy, who were fighting amongst themselves and wiping out each other. Many of the governors of the empire had proclaimed independence and carved out their own kingdom.[19] The governors of the provinces of Mazun and Yemen had already asserted their independence during the civil war of 628–632, thus resulting in the disintegration of Sasanian rule in the Arabian peninsula, which was uniting under the banner of Islam.[20] The empire was starting to look more like the Parthian feudal system before the fall of the Arsacid Empire.[21]