List of state leaders in 803

Africa

*Berghouata - Ilyâs ibn Sâlih (792-842)
*Idrisids - Idris II (791-828)
*Makuria - ?
*Nekor -
*#Sa'id I ibn Idris, King of Nekor (760-803)
*#Salih II ibn Sa'id, King of Nekor (803-864)

America

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

Asia

*Bohai/Balhae - Da Songlin/Dae Seung-rin, King of Bohai/Balhae (794-808)
*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)
*Malwa - Upendra, Paramara King of Malwa (c.800-c.818)
*Pallava - Thandi Varman, King of Pallava (775-825)
*Rashtrakuta - Govinda III, (793-814)
*Silla - Aejang, King of Silla (800-809)
*Tibet -
**Mu-tig btsan-po, Emperor of Tibet (764-817)
**Glan dar-ma, Emperor of Tibet (803-841)

Europe

*Asturias - Alfonso II, King of Asturias (791-842)
*Bulgaria -
*#Kardam, Khan of the Bulgars (777-803)
*#Krum, Khan of the Bulgars (803-814)
*Byzantine Empire - Nicephorus I, Roman Emperor (802-811)
*Cordoba - al-Hakam I, Emir of Cordoba (796-822)
*Essex - Sigered, King of Essex (798-812)
*Franks - Charlemagne, King of the Franks (768-814) and Holy Roman Emperor (800-814)
**Barcelona - Berà, Count of Barcelona (801-820)
**Gascony - Semen Lopo, Duke of Gascony (bef. 801-c.812)
**Italy - Pippin, King of Italy (781-810)
**Poitiers - Renaud, Count of Poitiers (795-843
**Toulouse - William of Gellone, Count of Toulouse (790-811)
**Urgell - Borell, Count of Urgell (789-820)
*Gwynedd - Cynan "Dindaethwy" ap Rhodri, King of Gwynedd (c.798-816)
*Ireland - Aed Oirdnide mac Neill, High King of Ireland (766-792)
**Ailech - Aed Oirdnide mac Neill, King of Ailech (788-819)
**Connacht - Muirgius mac Tommaltach, King of Connacht (796-815)
**Hy-Many - Cathal mac Murchadh, King of Hy-Many (794-816)
**Leinster - Finsnechta Cethardec mac Cellach, King of Leinster (795-808)
**Mide -
**#Diarmait mac Donnchado, King of Mide (802-803)
**#Conchobar mac Donnchado, King of Mide (803-833)
**Ulaid - Eochaid, King of Ulaid (787-804)
*Kartli - Ashot I Kurapalate, Grand Duke of Kartli (786-809)
*Kent - Eadwald, King of Kent (798?)
*Mercia - Cenwulf, King of Mercia (796-821) and East Anglia (c.799-821)
**Kent - Cuthred, King of Kent (c.798-807)
*Northumbria - Eardwulf, King of Northumbria (796-806/8)
*Pannonian Croats - Vojnomir, Duke of the Pannonian Croats (791-c.810)
*Papal States - Leo III, Pope of the Roman Catholic Church (795-816)
*Picts - Caustantín, King of the Picts (789-820)
*Saxons - Widukind, King of the Saxons (743-807)
*Strathclyde - Cynan, King of Strathclyde (c.798-816)
*Venice - Giovanni Galbaio, Doge of Venice (787-804)
*Wessex - Egbert, King of Wessex (802-839)

Middle East

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