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- John IV of Constantinople
- John IX of Rome
- John I Talaia of Alexandria
- John I of Antioch
- John I of Jerusalem
- John James the Chozebite
- John Jillions
- John Karastamatis of Santa Cruz
- John Kass
- John Kochurov
- John Krestiankin
- John Maximovitch
- John Maximovitch of Tobolsk
- John Meyendorff
- John Naukliros
- John Nehrebecki