John of Constantinople (died 839), also known as John the Confessor, was an abbot of the Cathares Monastery, in Constantinople. He clashed with the Byzantine Emperor Leo the Armenian, who was instituting a policy of iconoclasm. John survived torture for his iconodulism. He is considered a saint by the Eastern Orthodox ChurchOrthodox Holiness:: Around the Church Year With St John and the Roman Catholic Church,Saint of the Day, April 27 at SaintPatrickDC.org. Retrieved 2012-03-03. and is celebrated by them on 27 April and 18 April respectively.
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