Fourth Council of Constantinople
Eastern Orthodox
The Fourth Council of Constantinople was held in 879–880. It confirmed the reinstatement of Photius I as patriarch of Constantinople.
The result of this council is accepted by the Eastern Orthodox as having the authority of an ecumenical council.... Wikipedia
Start date: 879 AD
Accepted by: Eastern Orthodoxy
Date: 879–880
Documents and statements: Restoration of Photius, protection of Nicene creed