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