Emperor John

Emperor John may refer to:

Roman emperors

• Joannes (died 425), Western emperor but not recognized by the East

Eastern (Byzantine) emperors

• John I Tzimiskes
• John II Komnenos
• John III Doukas Vatatzes, in exile
• John IV Laskaris, in exile
• John V Palaiologos
• John VI Kantakouzenos
• John VII Palaiologos
• John VIII Palaiologos

Latin emperors

• John of Brienne

Emperors at Trebizond

• John I of Trebizond, Emperor of Trebizond from 1235 to 1238
• John II of Trebizond (c. 1262–August 16, 1297), Emperor of Trebizond from 1280 to 1297
• John III of Trebizond (c. 1321–1362), Emperor of Trebizond
• John IV of Trebizond (c. 1403–1459), Emperor of Trebizond from 1429 to 1459

Ethiopian emperors

• Yohannes I of Ethiopia, Emperor of Ethiopia
• Yohannes II of Ethiopia, Emperor of Ethiopia
• Yohannes III of Ethiopia, Emperor of Ethiopia
• Yohannes IV of Ethiopia, Emperor of Ethiopia

Russian emperors

• Ivan I of Russia, Ivan Danilovich Kalita; numbered with Tsars of Russia but not an emperor
• Ivan II of Russia, Ivan Ivanovich; numbered with Tsars of Russia but not an emperor
• Ivan III of Russia, Ivan Vasilevich; numbered with Tsars of Russia but not an emperor
• Ivan IV of Russia, Ivan Vasilevich, Ivan the Terrible, Tsar of Russia
• Ivan V of Russia, Ivan Alekseievich, Tsar of Russia
• Ivan VI of Russia, Ivan Antonovich, Emperor of Russia

Bulgarian emperors

• Ivan Vladislav of Bulgaria, Emperor of Bulgaria
• Ivan Asen I, Emperor of Bulgaria
• Ivan Asen II, Emperor of Bulgaria
• Ivan Asen III, Emperor of Bulgaria
• Ivan Stephen of Bulgaria, Emperor of Bulgaria
• Ivan Alexander of Bulgaria, Emperor of Bulgaria
• Ivan Shishman of Bulgaria, Emperor of Bulgaria
• Ivan Sratsimir of Bulgaria, Emperor of Bulgaria