The interpretation timeline

The Fourth Council of Constantinople

Condemned Photius and the council he had assembled against Pope Nicholas and Patriarch Ignatius.

869 Constantinople
Convoked under
Pope Adrian II, by the Emperor Basil
Present
102 bishops, 3 papal legates and 4 patriarchs
What it did
consigned to the flames the Acts of an irregular council brought together by Photius against Pope Nicholas and Ignatius, the legitimate Patriarch of Constantinople, and condemned Photius
Afterwards
“The Photian Schism, however, triumphed in the Greek Church, and no other general council took place in the East.”

These facts as given by the Catholic Encyclopedia (1913), "Councils" PD

Medieval

c. 750 – 1100
869
Event
The Fourth Council of Constantinople

Constantinople IV condemns Photius; it is the last general council held in the East.

Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.