List of state leaders in 816

Asia

• Bohai/Balhae - Da Yanyi/Dae Eon-ui , King of Bohai/Balhae (812-817?)
• China (Tang Dynasty) - Xianzong , Emperor of Tang China (806-820)
• Gurjara - Nagabhata II , Pratihara King of Gurjara (805-833)
• Japan (Heian Period) - Saga, Emperor of Japan (809-823)
• Silla - Heondeok , King of Silla (809-826)

Europe

• Dalriada - Constantine, King of Dalriada (781–820)
• East Anglia - Coenwulf , King of East Anglia (799–821)
• Essex - Sigered , King of Essex (798–825)
• Kent - Baldred , King of Kent (807–825)
• Mercia - Coenwulf I, King of Mercia (796–821)
• Northumbria - Eanred, King of Northumbria (810–841)
• Ireland - Aedh Oirdnidhe , High King of Ireland (793–817)
• Picts - Constantine, King of the Picts (789–820)
• Strathclyde -
  1. Cynan , King of Strathclyde (798–816)
  2. Arthgal f Dyfnwal , King of Strathclyde (816–872)
• Wales -
  1. Cynan Dindaethwy ap Rhodri , King of Gwynedd (798–816)
  2. Hywel Farf-Fehinog ab Caradog , King of Gwynedd (814–825)
• Wessex - Egbert, King of Wessex and Bretwalda (802–839)