In 1445 a part of the Assyrian Aramaic-speaking Church of the East entered into communion with the Catholic Church (mostly in the Ottoman Empire, but also in Persia). This group had a faltering start but has existed as a separate church since Pope Julius III consecrated Yohannan Sulaqa as Chaldean Patriarch of Babylon in 1553. Most Assyrian Catholics in Iran today are members of the Chaldean Catholic Church. The Aramaic-speaking community that remains independent is the Assyrian Church of the East. Both churches now have much smaller memberships in Iran than the Armenian Apostolic Church.
