870day.year
The Fourth Council of Constantinople closes.
The Fourth Council of Constantinople, an ecumenical synod of the Christian church, concluded in 870.
The Fourth Council of Constantinople convened in 869 under Pope Adrian II to address religious and political disputes within the Byzantine Empire.
It aimed to resolve conflicts over papal authority, iconoclasm, and the filioque clause in the Nicene Creed.
After deliberations in Rome and Constantinople, the council closed in February 870 with decrees against Patriarch Photios I.
The synod reaffirmed papal primacy and condemned several theological positions endorsed by the Byzantine court.
It had lasting effects on East-West relations, setting the stage for future schisms between the Roman Catholic and Eastern Orthodox churches.
Although later contested by Byzantine emperors, its canons remained influential in Western canon law.
870
Fourth Council of Constantinople