List of state leaders in 900

This is a list of heads of state, government leaders, and other rulers in the year 900.

Asia

• Abbasid Caliphate – Al-Mu'tadid (892–902)
• China (Tang dynasty) – Emperor Zhaozong (888–904)
• Japan – Emperor Daigo (897–930)
• Korea (Later Three Kingdoms Period)
  • Balhae – Dae Wihae (894–906)
  • Hubaekje – Gyeon Hwon (900–935)
    • Hubaekje is founded by Gyeon Hwon
  • Unified Silla – Hyogong (897–912)
• Khmer Empire – Yasovarman (899–910)

Europe

• First Bulgarian Empire – Simeon I, Knyaz of Bulgaria (893–927)
• Kingdom of Upper Burgundy – Rudolph I (888–912)
• Byzantine Empire – Leo VI the Wise (886–912)
• Caucasus -
  • Bagratuni Kingdom of Armenia – Smbat I (890–912)
  • Kingdom of Iberia – Adarnase IV (888–923)
  • Principality of Kakheti – Kvirike I (893–918)
  • Klarjeti –
    1. Bagrat I Mampali (889–900)
    2. David Mampali (900–943)
• Duchy of Croatia – Muncimir (892–910)
• England (Heptarchy) –
  • Danelaw –
    • Kingdom of East Anglia – Eohric (890–902)
    • Kingdom of Northumbria – Æthelwold of Wessex (900–902)
  • Kingdom of Wessex – Edward the Elder, King of the Anglo-Saxons (899–924)
    • Kingdom of Mercia – Æthelred, Lord of the Mercians (c. 883–911)
• East Francia – Louis the Child (899–911)
  • Bavaria – Luitpold, Margrave of Bavaria (895–907)
  • Duchy of Bohemia – Spytihněv I (894–915)
  • Kingdom of Lotharingia –
    1. Zwentibold] (895–900)
    2. Louis the Child (900–911)
    • County of Frisia – Dirk I (c. 896–923)
    • County of Hainaut – Sigard (898–908)
  • March of Pannonia – Aribo of Austria (871–909)
  • Duchy of Saxony – Otto the Illustrious (880–912)
  • Duchy of Thuringia – Conrad (892–906)
• West Francia – Charles the Simple (898–922)
  • County of Angoulême – Alduin I (886–916)
  • County of Anjou – Fulk I (898–942)
  • Duchy of Aquitaine – William I (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 –
    1. Ragenold of Neustria (895–900)
    2. Hugh I (900–950)
  • County of Paris – Robert I (888–923)
  • County of Toulouse – Odo (886–918)
  • County of Tours – Robert I (888–922)
  • County of Vermandois – Herbert I (896–907)
• Duchy of Gascony – Gassia II (893–c. 930)
• Hungarian tribal federation – Árpád, Grand Prince of the Magyars (c. 895–c. 907)
• Iberia –
  • County of Aragon – Galindo Aznárez II (893–922)
  • Kingdom of Asturias – Alfonso III (866–910)
  • County of Barcelona – Wilfred II Borrel (897–911)
  • Emirate of Córdoba – Abdullah ibn Muhammad al-Umawi (888–912)
  • County of Pallars – Raymond I (872–920)
  • Kingdom of Pamplona – Fortún Garcés (882–905)
  • County of Ribagorza – Raymond I (872–920)
• Ireland – Flann Sinna, High King of Ireland (879–916)
  • Kingdom of Ailech – Niall Glúndub (896–919)
  • Kingdom of Connacht
    1. Tadg mac Conchobair (888–900)
    2. Cathal mac Conchobair (900–925)
  • Uí Maine –
  • Kingdom of Leinster – Cerball mac Muirecáin (885–909)
  • Kingdom of Mide – Flann Sinna (877–916)
  • Kingdom of Munster – Finguine Cenn nGécan mac Loégairi (895–902)
• Italy -
  • Kingdom of Italy – disputed between:
    • Berengar (887–924)
    • Louis the Blind (900–905)
  • Papal States –
    1. Pope John IX (898–900)
    2. Pope Benedict IV (900–903)
    • Duchy of Spoleto – Alberic I (897–922)
    • March of Tuscany – Adalbert II (886–915)
  • Principality of Benevento –
    1. Radelchis II (897–900)
    2. Atenulf I (900–910)
  • County of Capua – Atenulf I (887–910)
  • Duchy of Gaeta – Docibilis I, Hypatus of Gaeta (866–906)
  • March of Ivrea – Anscar I of Ivrea (888–902)
  • Duchy of Naples – Gregory IV (898–915)
  • Principality of Salerno – Guaimar I (880–901)
  • Republic of Venice – Pietro Tribuno, Doge of Venice (887–912)
• Kievan Rus' – Oleg of Novgorod (882–912)
  • Novgorod – Oleg, Prince of Novgorod (879–912)
• Great Moravia – Mojmír II (894–906)
  • Principality of Nitra – Svatopluk II (894–906)
• Kingdom of Norway – Harald Fairhair (872–930)
• Kingdom of Provence – Louis the Blind (887–928)
• Kingdom of Alba (Scotland) -
  1. Donald II (889–900)
  2. Constantine II (900–943)
• Principality of Serbia – Petar Gojniković, Knez of Serbia (892–917)
• Volga Bulgaria – Almış (895–925)
• Wales –
  • Kingdom of Dyfed – Llywarch ap Hyfaidd (893–904)
  • Kingdom of Gwynedd – Anarawd ap Rhodri (878–916)
  • Kingdom of Powys –
    1. Merfyn ap Rhodri (878–900)
    2. Llywelyn ap Merfyn (900–942)
  • Kingdom of Seisyllwg – Cadell ap Rhodri (878–909)

Oceania

• Tonga – ʻAhoʻeitu, Tuʻi Tonga (c.900-?)