List of state leaders in 804

803 state leaders – Events of 804 – 805 state leaders – State leaders by year

Africa

• Berghouata - Ilyâs ibn Sâlih (792–842)
• Idrisids - Idris II (791–828)
• Makuria - ?
• Nekor - Salih II ibn Sa'id, King of Nekor (803–864)

America

• Copán - Yax-Pasaj Chan Yoaat, (763-aft.810)

Asia

• China (Tang Dynasty) - Dezong, Emperor of Tang China (780–805)
• Gurjara - Vatsaraja, Pratihara King of Gurjara (775–805)
• Japan (Heian Period) - Kammu, Emperor of Japan (781–806)
• Khmer empire - Jayavarman II, King of Khmer (802–850)
• Korea (North South States Period)
  • Balhae - Gang, King of Balhae (794–809)
  • Silla - Aejang, King of Silla (800–809)
• Malwa - Upendra, Paramara King of Malwa (c.800-c.818)
• Pallava - Thandi Varman, King of Pallava (775–825)
• Rashtrakuta - Govinda III, (793–814)
• Tibet -
  • Mu-tig btsan-po, Emperor of Tibet (764–817)
  • Glan dar-ma, Emperor of Tibet (803–841)

Europe

• Bulgaria - Krum, Khan of the Bulgars (803–814)
• Byzantine Empire - Nicephorus I, Roman Emperor (802–811)
• Caucasus
  • Principality of Kakheti - Grigol, Prince of Kakheti (786–827)
• Denmark - Gudfred, King of Denmark (804–810)
• England (Heptarchy) -
  • Kingdom of Essex - Sigered (798–812)
  • Kingdom of Kent - Cuthred of Kent (798–807)
  • Mercia - Cenwulf, King of Mercia (796–821) and East Anglia (c.799–821)
  • Northumbria - Eardwulf, King of Northumbria (796–806)
  • Wessex - Egbert, King of Wessex (802–839)
• Frankish Empire - Charlemagne, King of the Franks (768–814) and Holy Roman Emperor (800–814)
  • County of Barcelona - Berà (801–820)
  • Gascony - Sans I Lop of Gascony, Duke of Gascony (bef. 801-c.812)
  • Toulouse - William of Gellone, Count of Toulouse (790–811)
  • County of Urgell - Borell (798–820)
• Ireland - Áed Oirdnide, High King of Ireland (797–819)
  • Ailech - Aed Oirdnide mac Neill, King of Ailech (788–819)
  • Connacht - Muirgius mac Tommaltach, King of Connacht (796–815)
  • Uí Maine - Cathal mac Murchadh, King of Uí Maine (794–816)
  • Leinster - Finsnechta Cethardec mac Cellach, King of Leinster (795–808)
  • Kingdom of Mide - Conchobar mac Donnchado (803–833)
  • Ulaid - Eochaid mac Fiachnai, King of Ulaid (790–810)
• Italy - Pippin, King of Italy (781–810)
  • Principality of Benevento - Grimoald III (787–806)
  • Papal States - Pope Leo III (795–816)
  • Venice -
    1. Giovanni Galbaio, Doge of Venice (787–804)
    2. Obelerio Antenoreo, Doge of Venice (804–811)
• Pannonian Croats - Vojnomir, Duke of the Pannonian Croats (791-c.810)
• Saxons - Widukind, King of the Saxons (743–807)
• Scotland
  • Picts - Caustantin, King of the Picts (787–820)
• Spain -
  • Kingdom of Asturias - Alfonso II (791–842)
  • Caliphate 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

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