Chaldean Catholic Archeparchy of Kirkuk-Sulaimaniya
The foundation of the Chaldean Catholic diocese of Kirkuk has been attributed to Yohannan VIII Hormizd, who was recognised by the Vatican as patriarchal administrator of the patriarch of Babylon in 1780 and, after five decades of disputes and confrontations, as patriarch in 1830. According to the Chaldean Catholic priest Joseph Tfinkdji, Yohannan Hormizd visited the town of Kirkuk in 1789 while travelling from Mosul to Baghdad, and converted its Church of the East community to Catholicism. He is said to have consecrated a Chaldean metropolitan for Kirkuk, Mar Abraham, who resided in Aïnqawa during his reign, and died between 1821 and 1824. The source for this assertion is not clear. Abraham is not mentioned by any other source, and as Yohannan Hormizd himself (then considered by the Vatican to be merely metropolitan of Mosul) is styled 'metropolitan of Kirkuk' in a colophon of 1798, the Kirkuk region would seem to have been part of the diocese of Mosul at this period.
Adurbadagan
In 224, Adurbadagan submitted with little resistance to Ardashir I (r. 224–242) once he had defeated and killed Artabanus at the Battle of Hormizdegan. In 241/2, during the reign of his son and successor Shapur I (r. 240-270), the latter had to make an expedition to the province due to unrest. After that, the province became completely subdued. In the spring of 589, Adurbadagan was invaded by the Byzantine ally Guaram I of Iberia. However, when he discovered that the Sasanian army chief ("spahbed") Bahram Chobin had defeated a massive Turkic army in Khorasan, and was now marching to Adurbadagan, he quickly withdrew. The following year, Bahram Chobin, after having been disgraced by king Hormizd IV, rebelled against him, and quickly managed to take control over the whole Sasanian Empire.