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#The Encyclical Letter of Saint Photius (867)
#The First Letter of [[Michael I Cerularius of Constantinople|Michael Cerularius]] to Peter of Antioch (1054)
#The decisions of ‘the Councils of Constantinople in 1341 and 1351 on the Hesychast Controversy
#The Encyclical Letter of Saint Mark of Ephesus (1440-1441).