John was surnamed Mavron "The Black." He was a very educated man and, at the same time, a spiritual man. At the time of Emperor Alexius Comnenis, John in his old age, became the metropolitan of Euchaita. He is especially famous in that St. Basil, St. Gregory the Theologian and St. John Chyrsostom (January 30) appeared and explained to him how all three of them are equally glorified in heaven. After this vision the dispute among the people concerning who of the three saints was greater and who was lesser was quieted down. St. John also wrote the famous Canon to the Most Sweet Jesus and a Canon to the Guardian angel and, in addition to this, other beneficial writings. He died peacefully in the year 1100 A.D.
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