List of rulers named Johannes
The following rulers were called John :
Rome
Byzantine emperor
- John I. Tzimiskes ( 969 - 976 )
- John II Comnenus ( 1118 - 1143 )
- John III Dukas Vatatzes ( 1222 - 1254 )
- John IV Laskaris ( 1258 - 1261 )
- John V Palaeologus ( 1341 - 1391 )
- John VI Cantacuzenus ( 1347 - 1354 )
- John VII Palaeologus ( 1390 )
- John VIII Palaeologus ( 1425 - 1448 )
Emperor of Trebizond
- John I Comnenus ( 1235 - 1238 )
- John II Comnenus ( 1280 - 1297 )
- John III Comnenus ( 1342 - 1344 )
- John IV Comnenus ( 1429 - 1458 )
Despots of Epirus
Thessalonike
- John Angelos ( 1240 - 1243 ), Emperor of Thessalonica
Ethiopia
- John I ( 1667 - 1682 ), Emperor of Ethiopia
- John II ( 1769 ), Emperor of Ethiopia
- John III ( 1840 - 1841 , 1845 , 1850 - 1851 ), Emperor of Ethiopia
- John IV. ( 1871 - 1889 ) Emperor of Ethiopia
Asia
- Priest-King John , legendary ruler of a powerful Christian empire in Asia
Church rulers
- John I (Münsterschwarzach) († probably 1334), Abbot of Münsterschwarzach
- Johannes I. Kaufmann († 1489), Abbot of Ebrach
- Johannes II. Leiterbach († 1533), Abbot of Ebrach
- John III Wolf († 1540), Abbot of Ebrach
- John IV Beck (1516–1562), Abbot of Ebrach
- Johannes V. Dressel († 1637), Abbot of Ebrach
- John VI Pfister († 1641), Abbot of Ebrach
- Johannes von Nikiu , Egyptian bishop and historian of the 7th century
- John of Tobolsk (1651–1715), bishop and metropolitan and saint of the Russian Orthodox Church
- John of Trogir (Croatian Ivan Trogirski; † 1111), Bishop of Trogir; Patron saint of the southern Croatian city of Trogir
- John the Alms Giver (c. 550–618), Patriarch of Alexandria, saint of the Catholic and Orthodox Churches