This council is not regarded as ecumenical by all Orthodox Christians, but some major voices in the Orthodox world do so, including 20th century theologians Fr. [[John S. Romanides]] and Fr. [[George Metallinos]] (both of whom refer repeatedly to the "Eighth and [[Ninth Ecumenical Council]]s"), as well as Fr. [[John Meyendorff]], Fr. [[George Dragas]] and Metropolitan [[Hierotheos (Vlachos) of Nafpaktos]].
One of the first references as "Eighth Ecumenical Council" is to be made in 15th century by [[Mark of Ephesus|St. Mark of Ephesus]], who expresses the general theological view of that time in Constantinople during the [[Council of Florence|so-called 'robber-council' in Ferrara-Florence]] (to be referenced in [[The Rudder|Pedalion]] comments regarding
to this council - called there " The Synod gathered in Agia Sophia").
Further, the 1848's [[Encyclical of the Eastern Patriarchs]] refers explicitly to the "Eighth Ecumenical Council" regarding the synod of 879-880 and was signed by the [[patriarch]]s of [[Church of Constantinople|Constantinople]], [[Church of Jerusalem|Jerusalem]], [[Church of Antioch|Antioch]], and [[Church of Alexandria|Alexandria]] as well as the [[Holy Synod]]s of the first three.