Yohannan VIII Hormizd
Mar Yohannan VIII Hormizd (often referred to by European missionaries as "John Hormez" or "Hanna Hormizd") (1760–1838) was the last hereditary patriarch of the Eliya line of the Church of the East and the first patriarch of a united Chaldean Church. After succeeding his uncle Eliya XII Denha in 1780 as patriarch of Mosul, he made a Catholic profession of faith and was recognised in 1783 by the Vatican as patriarchal administrator and archbishop of Mosul. His career as patriarchal administrator was controversial, and was marked by a series of conflicts with his own bishops and also with the Vatican. Suspended from his functions in 1812 and again in 1818, he was reinstated by the Vatican in 1828. In 1830, following the death of the Amid patriarchal administrator Augustine Hindi, he was recognised by the Vatican as "patriarch of Babylon of the Chaldeans" and the Mosul and Amid patriarchates were united under his leadership. This event marked the birth of the since unbroken patriarchal line of the Chaldean Catholic Church. Yohannan Hormizd died in 1838 and his successor Nicholas I Zaya was chosen by the Vatican, ending the centuries-old practice of hereditary succession in the Eliya line of the Church of the East.
Yohannan VIII Hormizd
Yohannan Hormizd was eventually ransomed by his supporters and returned to Mosul, where he had several of his opponents imprisoned. After a series of mutual recriminations, the Rabban Hormizd monks and the Catholic missionaries wrote jointly to the Propaganda calling for Yohannan's deposition, alleging that he was opposed to their order, that he incited the Kurds of Isma'il Pasha against them, and that he was endeavouring to lead the Chaldean proselytes back to Nestorianism. The Vatican was alarmed at these charges and on 15 February 1812 suspended Yohannan from his functions as archbishop of Mosul and patriarchal administrator and appointed Shemon Sayyegh apostolic vicar for Mosul and the priest Giwargis of Alqosh apostolic vicar for the patriarchate of Babylon. Both men were placed under the direct authority of Augustine Hindi, who was named "apostolic delegate for the affairs of the patriarchate of Babylon". While this decision temporarily placed the two Catholic patriarchates under a single trustworthy authority, it was from the Vatican's point of view little more than a makeshift, as Hindi could never command the same prestige in the Mosul district as a member of the old patriarchal family.