The Fifth Council of Constantinople was a series of councils held in Constantinople in 1341, 1347 and 1351, which exonerated St. Gregory Palamas's hesychastic theology and condemned the rationalistic philosophy of Barlaam of Calabria. The result of these councils is regarded as the Ninth Ecumenical Council by some Orthodox Christians, although many others do not acknowledge this claim. Principal supporters of the view that this series of councils comprises the Ninth Ecumenical Council include Metropolitan Hierotheos (Vlachos) of Nafpaktos, Fr. John S. Romanides, and Fr. George Metallinos.

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• The Eighth and Ninth Ecumenical Councils

v • d • e Ecumenical councils
Oriental Orthodox	Nicaea I · Constantinople I · Ephesus I · Ephesus II
R. Catholic & Eastern Orthodox	Nicaea I · Constantinople I · Ephesus · Chalcedon · Constantinople II · Constantinople III · Nicaea II · Constantinople IV
Eastern Orthodox	Quinisext Council · Constantinople V · Synod of Jerusalem
Roman Catholic	Lateran I · Lateran II · Lateran III · Lateran IV · Lyon I · Lyon II · Vienne · Constance · Council of Basel-Ferrara-Florence · Lateran V · Trent · Vatican I · Vatican II
The Assyrian Church of the East accepts Nicea I and Constaninople I; Anglicans and most Protestant churches accept the first seven Catholic/Eastern Orthodox Councils.