council · 869 · Constantinople
The council of 869–870 — 102 bishops at its close — deposed and anathematized Photius and restored Ignatius to Constantinople. Rome numbers it the eighth ecumenical council; the East rejected it within a decade, and its canons fed the growing estrangement.
The Fourth Council of Constantinople was the eighth ecumenical council of the Catholic Church held in Constantinople from 5 October 869, to 28 February 870. It was attended by over 103 bishops. In contrast, the pro-Photian council of 879–80 was attended by 383 bishops. The Council met in ten sessions from October 869 to February 870 and issued 27 canons.
Rome's demand that Photius' elevation be undone and Ignatius restored.
Photius deposed and anathematized, Ignatius restored; 27 canons — a council the West counts ecumenical and the East rejected within ten years.