Category
page 19th-century church councils
Fourth Council of Constantinople (Roman Catholic)
8th ecumenical council of the Catholic Church; held in Constantinople 869 to 870
Fourth Council of Constantinople (Eastern Orthodox)
synoz convoked by Byzantine Emperor Basil I and held in 879–880
Photian schism
9th-century schism between Rome and Constantinople
synod of Arles
Wikimedia list article

Council of Tours
Wikimedia disambiguation page
Council of Aachen
Wikimedia list article
Council of Preslav
synod
Council of Constantinople
local council that restored Iconoclasm
Council of Constantinople
council held in 861
Synods of Aachen
Series of synods held at Aachen between 816 and 819
Synod of Milan
Wikimedia disambiguation page
Councils of Sens