List of state leaders in 904

See also
List of state leaders in 903 Events of 904 List of state leaders in 905 State leaders by year

This is a list of heads of state, government leaders, and other rulers in the year 904.

Africa

Algeria – Yusuf Abu Hatim, Rustamid Emir (901–906)
Egypt
- Harun, Tulunid Emir (896–904)
- Shaiban, Tulunid Emir (904–905)
Ifriqiya – Abu Mudar Ziyadat Allah III, Aghlabid Emir (903–909)
Morocco
- Yahya III, Idrisid Emir (880–904)
- Yahya IV, Idrisid Emir (904–922)

Asia

China (Tang Dynasty) –
1. Zhaozong, Emperor of Tang China (888–904)
2. Emperor Ai, Emperor of Tang China (904–907)
Japan – Emperor Daigo, emperor of Japan (897–930)
Korea (Later Three Kingdoms Period)
- Balhae - Dae Wihae, King of Balhae (894–906)
- Hubaekje – Gyeon Hwon, King of Hubaekje (900–935)
- Later Goguryeo – Gung-ye, King of Later Goguryeo (901–904); King of Majin (904–911); King of Taebong (911–918)
- Silla – Hyogong, King of Silla (897–912)
Khmer Empire – Yasovarman, King (899–910)

Europe

Bulgaria - Simeon I, Knyaz of Bulgaria (893–927)
Upper Burgundy - Rudolph I, King of Upper Burgundy (888–912)
Byzantine Empire - Leo VI (886–912)
Caucasus
- Kingdom of Armenia - Smbat I (890–912)
- Kingdom of Iberia - Adarnase IV (888–923)
- Principality of Kakheti - Kvirike I, Prince of Kakheti (893–918)
- Klarjeti - David Mampali (900–943)
Littoral Croatia - Muncimir, Duke of Littoral Croatia (892–910)
England (Heptarchy) -
- Danelaw -
  - Kingdom of East Anglia - Guthrum II (902–916)
  - Northumbria - Eowils and Halfdan, Kings of Northumbria (902–910)
- Wessex - Edward the Elder, King of the Anglo-Saxons (899–924)
  - Mercia - Aethelred, Lord of the Mercians (c. 883–911)
East Francia - Louis the Child, King of East Francia (899–911)
- Bavaria - Luitpold, Margrave of Bavaria (895–907)
- Duchy of Bohemia - Spytihněv I (894–915)
- Lotharingia - Louis the Child, King of Lotharingia (900–911)
  - County of Frisia - Dirk I (c. 896–923)
  - County of Hainault - Sigard (898–908)
  - Duchy of Lotharingia - Gebhard (903–910)
- March of Pannonia - Aribo of Austria (871–909)
- Duchy of Saxony - Otto the Illustrious (880–912)
- Thuringia - Conrad, Duke of Thuringia (892–906)
West Francia - Charles the Simple, King of West Francia (898–922)
- County of Angoulême - Alduin I (886–916)
- County of Anjou - Fulk I (898–942)
- Aquitaine - William I, Duke of Aquitaine (893–918)
- Duchy of Brittany - Alan I (876–907)
- Duchy of Burgundy - Richard the Justiciar (898–921)
- County of Flanders - Baldwin II (879–918)
- County of Maine - Hugh I (900–950)
- County of Paris - Robert I (888–923)
- County of Toulouse - Odo (886–918)
- Tours - Robert I, Count of Tours (888–922)
- County of Vermandois - Herbert I (896–907)
Gascony - Gassia II, Duke of Gascony (893–c. 930)
Hungarian tribal federation - Árpád, Grand Prince of the Magyars (c. 895–c. 907)
Ireland - Flann Sinna, High King of Ireland (879–916)
- Ailech - Niall Glúndub, King of Ailech (896–919)
- Connacht - Cathal mac Conchobair, King of Connacht (900–925)
- Uí Maine -
  1. Mughroin mac Sochlachan, King of Uí Maine (?–904)
  2. Sochlachan mac Diarmata, King of Uí Maine (904–909)
- Leinster - Cerball mac Muirecáin, King of Leinster (885–909)
- Kingdom of Mide - Flann Sinna (877–916)
- Munster - Cormac mac Cuilennáin, King of Munster (902–908)
Italy - Berengar, King of Italy (887–924), disputed by Louis the Blind, King of Italy (900–905) and Holy Roman Emperor (901–905)
- Principality of Benevento - Atenulf I (900–910)
- County of Capua - Atenulf I (887–910)
- Duchy of Gaeta - Docibilis I, Hypatus of Gaeta (866–906)
- March of Ivrea - Adalbert I (902–923)
- Duchy of Naples - Gregory IV (898–915)
- Papal States -
  1. Antipope Christopher (903–904)
  2. Pope Sergius III (904–911)
- Principality of Salerno - Guaimar II (901–946)
- Duchy of Spoleto - Alberic I (897–922)
- March of Tuscany - Adalbert II (886–915)
- Republic of Venice - Pietro Tribuno, Doge of Venice (887–912)
Kievan Rus' - Oleg of Novgorod, Prince of Kiev (882–912)
Great Moravia - Mojmír II, King of Great Moravia (894–906)
- Principality of Nitra - Svatopluk II, Prince of Nitra (894–906)
Norway - Harald I Fairhair, King of Norway (872–930)
Novgorod - Oleg, Prince of Novgorod (879–912)
Kingdom of Provence - Louis the Blind (887–928) and Holy Roman Emperor (901–905)
Kingdom of Alba (Scotland) - Constantine II (900–943)
Serbia - Petar Gojniković, Knez of Serbia (892–917)
Spain -
- County of Aragon - Galindo Aznárez II (893–922)
- Kingdom of Asturias - Alfonso III (866–910)
- County of Barcelona - Wilfred II Borrel (897–911)
- Caliphate of Córdoba - Abdallah ibn Muhammad (888–912)
- County of Pallars - Raymond I (872–920)
- Kingdom of Pamplona - Fortún Garcés (882–905)
- County of Ribagorza - Raymond I (872–920)
Wales -
- Kingdom of Dyfed -
  1. Llywarch ap Hyfaidd (893–904)
  2. Rhodri ap Hyfaidd (904–905)
- Kingdom of Gwynedd - Anarawd ap Rhodri (878–916)
- Kingdom of Powys - Llywelyn ap Merfyn (900–942)
- Kingdom of Seisyllwg - Cadell ap Rhodri (878–909)

Middle East

Abbasid Caliphate – Al-Muktafi (902–908)
Byzantine Empire, Leo VI the Wise (886–912)
Persia
- Saffarids – Tahir I (901–908)
- Samanids – Isma'il (892–907)