List of state leaders in 804

This is a list of heads of state, government leaders, and other rulers in the year 804.

Africa

• Berghouata – Ilyâs ibn Sâlih (792–842)
• Idrisid dynasty – Idris II (791–828)
• Kingdom of Makuria – ?
• Kingdom of Nekor – Salih II ibn Sa'id (803–864)

America

• Copán – Yax Pasaj Chan Yopaat (763-aft.810)

Asia

• China (Tang dynasty) – Emperor Dezong (780–805)
• Pratihara Empire – Vatsraja (775–805)
• Japan (Heian period) – Emperor Kanmu (781–806)
• Khmer Empire – Jayavarman II (802–850)
• Korea (North South States Period)
  • Balhae – Gang (794–809)
  • Unified Silla – Aejang (800–809)
• Malwa – Upendra (Paramara dynasty) (c.800-c.818)
• Pallava Kingdom – Dantivarman (775–825)
• Rashtrakuta – Govinda III (793–814)
• Tibetan Empire – Sadnalegs (800–815)

Europe

• First Bulgarian Empire – Krum, Khan of the Bulgars (803–814)
• Byzantine Empire – Nikephoros I (802–811)
• Caucasus
  • Principality of Kakheti – Grigol (786–827)
• Kingdom of Denmark – Gudfred (804–810)
• England (Heptarchy) –
  • Kingdom of Essex – Sigered (798–812)
  • Kingdom of Kent – Cuthred of Kent (798–807)
  • Kingdom of Mercia – Coenwulf (796–821) and East Anglia (c.799–821)
  • Kingdom of Northumbria – Eardwulf (796–806)
  • Kingdom of Wessex – Egbert (802–839)
• Frankish Empire – Charlemagne (768–814)
  • County of Barcelona – Berà (801–820)
  • Duchy of Gascony – Sans I Lop of Gascony (bef. 801-c.812)
  • County of Toulouse – William of Gellone (790–811)
  • County of Urgell – Borell (798–820)
• Ireland – Áed Oirdnide, High King of Ireland (797–819)
  • Kingdom of Ailech – Áed Oirdnide (788–819)
  • Kingdom of Connacht – Muirgius mac Tommaltach (796–815)
  • Uí Maine – Cathal mac Murchadh (794–816)
  • Kingdom of Leinster – Fínsnechta Cethardec (795–808)
  • Kingdom of Mide – Conchobar mac Donnchada (803–833)
  • Kingdom of Ulaid – Eochaid mac Fiachnai (790–810)
• Italy – Pepin, King of Italy (781–810)
  • Principality of Benevento – Grimoald III (787–806)
  • Papal States – Pope Leo III (795–816)
  • Republic of Venice –
    1. Giovanni Galbaio, Doge of Venice (787–804)
    2. Obelerio degli Antenori, Doge of Venice (804–811)
• Pannonian Croatia – (791-c.810)
• Saxons – Widukind (743–807)
• Scotland
  • Kingdom of the Picts – Causantín mac Fergusa (787–820)
• Spain -
  • Kingdom of Asturias – Alfonso II (791–842)
  • Emirate of Córdoba – al-Hakam I (796–822)
• Wales -
  • Kingdom of Gwynedd – Cynan Dindaethwy ap Rhodri (c.798–816)
  • Kingdom of Powys – Cadell ap Elisedd (773–808)

Middle East

• Abbasid Caliphate (Baghdad) – Harun al-Rashid (786–809)
  • Ifriqiya – Ibrahim I ibn al-Aghlab ibn Salim, Emir of Ifriqiya (800–812)