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