List of state leaders in 837

This is a list of heads of state, government leaders, and other rulers in the year 837.

Asia

• Abbasid Caliphate – al-Mu'tasim (833–842)
• China (Tang dynasty) – Emperor Wenzong (826–840)
• Pratihara Empire – Mihira Bhoja I (c. 836–886)
• Japan (Heian period) – Emperor Ninmyō (833–850)
• Korea (North South States Period)
  • Balhae – Dae Ijin (830–857)
  • Unified Silla – Huigang (836–838)

Europe

• First Bulgarian Empire – Presian, Khan of the Bulgars (836–852)
• 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)
    • County of Vasconia – Sans II Sancion of Gascony (836–864)
    • County of Toulouse – Bernard of Septimania (835–842)
  • County of Barcelona – Bernard of Septimania (835–844)
  • Duchy of Bavaria – Louis the German (817–843)
  • Duchy of Croatia – Mislav of Croatia (835–845)
  • County of Maine – Rorgon I (832–840)
  • County of Nantes – Ricwin (831–841)
  • County of Poitiers – Emenon (828–839)
  • County of Urgell – Sunifred, Count of Barcelona (834–848)
• Ireland – Niall Caille, High King of Ireland (833–846)
  • Kingdom of Ailech – Niall Caille (823–846)
  • Kingdom of Connacht – Cathal mac Muirgiussa (833–839)
  • Uí Maine – Cathal mac Ailell (834–844)
  • Kingdom of Leinster – Bran mac Fáeláin (835–838)
  • Kingdom of Mide – Máel Ruanaid mac Donnchada Midi (833–843)
  • Kingdom of Munster – Fedelmid mac Crimthainn (820–847)
  • 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 – Sicard of Benevento (832–839)
  • Papal States – Pope Gregory IV (827–844)
  • Duchy of Spoleto – Berengar (836–841)
  • Republic of Venice – Pietro Tradonico, Doge of Venice (836–864)
• Pannonian Croatia – Ratimir (829–838)
• Scotland
  • Kingdom of the Picts
    • Drest IX (834–836/837)
    • Eóganan mac Óengusa (836/837–839)
• Principality of Serbia – Vlastimir (835–850)
• Spain –
  • County of Aragon – Galindo Garcés (833–844)
  • 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)

Middle East

• Abbasid Caliphate – Al-Mu'tasim (833–842)
• Byzantine Empire – Theophilos (829–842)

Notes

1. Though East Anglia, Northumbria and Mercia are traditionally perceived to have been in the heptarchy they were largely independent kingdoms until its conquest by the Danes in 869 and 867, respectively – where Mercia was conquered by Wessex in 874. All other members of the heptarchy had been conquered by Wessex and by this time had no form or king.