List of state leaders in 864

863 state leaders - Events of 864 - 865 state leaders - State leaders by year----

Asia

*Armenia - Ashot I, Prince of Armenia, (856–890)
*Bohai/Balhae - Da Qianhuang/Dae Geon-hwang, King of Bohai/Balhae, (857–871)
*Byzantine Empire - Michael III, Byzantine Emperor, (842–867)
*Champa - Vikrantavarman III, King of Champa, (854–875)
*China (Tang Dynasty) - Yizong, Emperor of Tang China, (859–873)
*Gurjara - Mihira Bhoja I, Pratihara King of Gurjara, (c. 836–886)
*Japan (Heian Period) - Emperor Seiwa, Emperor of Japan, (858–876)
*Khmer Empire - Jayavarman III, Emperor of Khmer, (850–877)
*Rashtrakuta - Amoghavarsha I, King of Rashtrakuta
*Silla - Gyeongmun, King of Silla, (861–875)
*Wethali - Paulataingsandra, King of Wethali, (849–875)

Europe

*Asturias - Ordoño I, King of Asturias (850-866)
*Bulgaria - Boris I, Knyaz of Bulgaria, (852–889)
*Croatia - Duke of Croatia
**Tripimir I, (c. 845–864)
**Zdeslav, (864, 876–879)
**Domagoj, (864–876)
*East Anglia¹ - Edmund, King of East Anglia (855–870)
*Eastern Francia - Louis II, King of Eastern Francia, (855–875)
*England - Æthelbert of Wessex, Bretwalda (860–871)
*Friesland - Rorik, King of the Danish Vikings in Friesland (850-880)
*Holy Roman Empire - Louis II, Holy Roman Emperor, (855–875)
*Ireland - Aedh Finnliath, High King of Ireland, (861–876)
*Lotharingia - Lothair II, King of Lotharingia (855–869)
*Mercia¹ - Burgred, King of Mercia (852–874)
*Northumbria¹ - Osbert, King of Northumbria (849–867)
*Novgorod - Rurik², Prince of Novgorod (862–879)
*Scotland - Constantine I, King of Scots and Picts (862–877)
*Spain - Muhammad I, Emir of Cordoba (852–886)
*Strathclyde - Arthgal f Dyfnwal, King of Strathclyde (816–872)
*Tuscany - Adalbert I, Margrave of Tuscany (847–884)
*Venice -
*#Pietro Tradonico, Doge of Venice (837-864)
*#Orso I Participazio, Doge of Venice (864-881)
*Wales - Rhodri "Mawr" ap Merfyn, King of Gwynedd (844–878)
*Western Francia - Charles the Bald, King of Western Francia (843-877)

Notes

#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.
#Rurik may have been a mythological figure. For more details on this debate, see Rurik.