List of state leaders in 831

This is a list of heads of state, government leaders, and other rulers in the year 831.

Asia

• Abbasid Caliphate – al-Ma'mun (813–833)
• China (Tang dynasty) – Emperor Wenzong (826–840)
• Pratihara Empire – Nagabhata II (805–833)
• Japan (Heian period) – Emperor Junna (823–833)
• Korea (North South States Period)
  • Balhae – Dae Ijin (830–857)
  • Unified Silla – Heungdeok (826–836)

Europe

• First Bulgarian Empire –
  1. Omurtag, Khan of the Bulgars (814–831)
  2. Malamir, Khan of the Bulgars (831–836)
• Byzantine Empire – Theophilos (829–842)
• Caucasus
  • Principality of Iberia – Bagrat I Kuropalates (830–876)
  • Principality of Kakheti – Vache (827–839)
• Kingdom of Denmark – Horik I (813–854)
• England (Heptarchy) – Egbert of Wessex, Bretwalda (829–839)
  • Kingdom of East Anglia – Æthelstan (826–c. 839)
  • Kingdom of Kent – Egbert of Wessex (825–839)
  • Kingdom of Mercia – Wiglaf (830–839)
  • Kingdom of Northumbria – Eanred (810–841)
  • Kingdom of Wessex – Egbert (802–839)
• Frankish Empire –
  • Louis the Pious, King of the Franks and senior Holy Roman Emperor (814–840)
  • Lothair I, King of Italy and junior Holy Roman Emperor (817–855)
  • Kingdom of Aquitaine – Pepin I (817–838)
    • Auvergne – Guerin of Provence, Count of Auvergne (819–839)
    • Duchy of Gascony – Aznar Sánchez (819–836)
    • County of Toulouse – Berengar the Wise (816–835)
  • County of Barcelona – Bernard of Septimania (826–832)
  • Duchy of Bavaria – Louis the German (817–843)
  • Duchy of Croatia – Vladislav of Croatia (c. 821–835)
  • County of Nantes –
    1. Lambert I (818–831)
    2. Ricwin (831–841)
  • County of Poitiers – Emenon (828–839)
  • County of Urgell – Aznar Galíndez I (820–834)
• Ireland – Conchobar mac Donnchada, High King of Ireland (819–833)
  • Kingdom of Ailech – Niall Caille (823–846)
  • Kingdom of Connacht – Diarmait mac Tommaltaig (815–833)
  • Uí Maine –
  • Kingdom of Leinster – Cellach mac Brain (829–834)
  • Kingdom of Mide – Conchobar mac Donnchada (803–833)
  • Kingdom of Ulaid – Muiredach mac Eochada (825–839)
• Kingdom of Italy – Lothair I, King of Italy and junior Holy Roman Emperor (818–855)
  • Principality of Benevento – Sico (817–832)
  • Papal States – Pope Gregory IV (827–844)
  • Republic of Venice – Giovanni I Participazio, Doge of Venice (829–836)
• Pannonian Croatia – Ratimir (829–838)
• Scotland
  • Kingdom of the Picts – Óengus II (820–834)
• Spain –
  • County of Aragon – García Galíndez (820–833)
  • Kingdom of Asturias – Alfonso II (791–842)
  • Emirate of Córdoba – Abd ar-Rahman II (822–852)
  • Kingdom of Pamplona – Íñigo Arista (824–851/852)
• Wales –
  • Kingdom of Gwynedd – Merfyn Frych (825–844)
  • Kingdom of Powys – Cyngen ap Cadell (808–855)