His Holiness, Arch-Patriarch Thomas VI (birth name: Cornelius Ventruri) was the last Arch-Patriarch of the Selucian Patriarchal Church, before it merged into the Aurorian Patriarchal Church. He convened the Second Session of the Second Council of Auroria, and resigned his office in order to have the new Arch-Patriarch of the Aurorian Patriarchal Church elected. He was then among the cardinals that elected Justus XI.