Emperor John
- Ivan Alexander of Bulgaria
- Ivan Asen I
- Ivan Asen II
- Ivan Asen III
- Ivan I of Russia
- Ivan II of Russia
- Ivan III of Russia
- Ivan IV of Russia
- Ivan Shishman of Bulgaria
- Ivan Sratsimir of Bulgaria
- Ivan Stephen of Bulgaria
- Ivan V of Russia
- Ivan VI of Russia
- Ivan Vladislav of Bulgaria
- Joannes
- John I Tzimiskes
- John I of Trebizond
- John II Komnenos
- John II of Trebizond
- John III Doukas Vatatzes
- John III of Trebizond
- John IV Laskaris
- John IV of Trebizond
- John V Palaiologos
- John VI Kantakouzenos
- John VII Palaiologos
- John VIII Palaiologos
- John of Brienne
- Yohannes I of Ethiopia
- Yohannes II of Ethiopia
- Yohannes III of Ethiopia
- Yohannes IV of Ethiopia