Archimandrite John (Ioann, Russian: Архимандрит Иоанн, secular name Ivan Mikhailovich Krestiankin, Russian: Иван Михайлович Крестьянкин; 1910–2006) was archimandrite of the Pskov Caves Monastery of Russian Orthodox Church.
He was born in 1910 in the city of Oryol as an eighth child in the family of Mikhail and Elizaveta Krestiankin. The name Ivan was given to the boy in honour of Saint John of Desert. His letters and theological works are well known and widely published in Russia and some other countries. Many cases of Fr. John's clairvoyance and wonderworking were recorded.
In 1950 John was arrested by Soviet authorities for his pastoral service and sentenced for seven years of labour camps. He was freed in 1955.
Father John was a spiritual father and confessor for many Orthodox parishioners, providing religious instructions and guidances on various aspects of faith and Christian life within Orthodox Church. Among his notable spiritual children included Archimandrite Tikhon (Shevkunov), the author of the best-selling spiritual memoir Everyday Saints, and Archimandrite Ilarion (Prikhodko), a highly regarded spiritual father in his own right who ministered in the Novgorod region.
Among his most famous books are "The Experience of Preparing a Confession", "Sermons, Thoughts and Congratulations", "Reference Book for Monastics and Laymen", the compilation "Letters of Archimandrite John (Krestiankin)".
John Krestiankin died in 2006  at the age of 95 years.
- The Experience of Preparing a Confession (Опыт построения исповеди)
- Sermons, Thoughts and Congratulations
- Reference Book for Monastics and Laymen
- on YouTube
- "May God Give You Wisdom", The Letters of Fr. John Krestiankin (published by Sretensky Monastery and St. Xenia Skete), "Pravoslavie.RU" Orthodox Portal, December 2007, in Russian
- "May God Give You Wisdom", The Letters of Fr. John Krestiankin, "Pravoslavie.RU" Orthodox Portal, February 2007
- Shevkunov, Tikhon (2011). Everyday Saints And Other Stories (6th ed.). Retrieved Feb 17, 2013.
- A guide to confession, part X, from talks by Archimandrite Ioann Krestiankin, Orthodox America, by Nikodemos Orthodox Publication society
- "Our faith", Father Ioann Krestiankin, "Orthodoxy and the World" (Pravmir.com) Portal, February 2006
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