List of state leaders in 864
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This is a list of heads of state, government leaders, and other rulers in the year 864.
Asia
- Bagratid Armenia – Ashot I (856–890)
- Byzantine Empire – Michael III, (842–867)
- Champa – Vikrantavarman III (854–875)
- China (Tang dynasty) – Emperor Yizong (859–873)
- Pratihara Empire – Mihira Bhoja I, (c. 836–886)
- Japan (Heian period) – Emperor Seiwa (858–876)
- Khmer Empire – Jayavarman III (850–877)
- Khorasan (Saffarid dynasty) – Ya'qub ibn al-Layth al-Saffar (858–876)
- Korea (North South States Period)
- Balhae – Dae Geonhwang (857–871)
- Unified Silla – Gyeongmun (861–875)
- Rashtrakuta – Amoghavarsha I (814–878)
- Wethali – Paulataingsandra (849–875)
Europe
- First Bulgarian Empire – Boris I, Knyaz of Bulgaria (852–889)
- Byzantine Empire – Michael III (842–867)
- Caucasus
- Principality of Iberia – Bagrat I Kuropalates (830–876)
- Principality of Kakheti – Gabriel (861–881)
- Duchy of Croatia –
- Kingdom of Denmark – Horik II (854–c. 866)
- England (Heptarchy) –
- Kingdom of East Anglia – Edmund the Martyr (854–869)
- Kingdom of Mercia – Burgred (852–874)
- Kingdom of Northumbria – Ælla (862/863–867)
- Kingdom of Wessex – Æthelberht (860–865)
- East Francia – Louis the German (843–876)
- Duchy of Saxony – Liudolf, Duke of Saxony (844–866)
- Duchy of Thuringia – Thachulf (849–873)
- West Francia – Charles the Bald (843–877)
- County of Angoulême – Emenon (863–866)
- County of Anjou – Robert the Strong (861–866)
- Duchy of Aquitaine – Ranulf I (854–866)
- Kingdom of Aquitaine –
- Pepin II of Aquitaine (854–864)
- Charles the Child (855–866)
- County of Auxerre –
- Conrad I (859–864)
- Robert the Strong (864–866)
- County of Barcelona – Humfrid (858–865)
- Duchy of Brittany – Salomon (857–874)
- County of Flanders – Baldwin I (862–879)
- County of Maine – Rorgon II (853–865)
- March of Neustria –
- Adalard the Seneschal (861–865)
- Udo (861–865)
- Berengar I (861–865)
- County of Poitiers – Ranulf I (854–866)
- County of Toulouse – Humfrid (863–865)
- County of Tours – Robert the Strong (860–866)
- County of Troyes – Rudolph I (858–866)
- County of Urgell – Solomon (848–869)
- Duchy of Gascony –
- Sans II Sancion of Gascony (836–864)
- Arnaut (864)
- Sans III Mitarra (864–893)
- Ireland – Áed Findliath, High King of Ireland (862–879)
- Kingdom of Ailech – Áed Findliath (c. 855–879)
- Kingdom of Connacht – Mugron mac Máel Cothaid (848–872)
- Uí Maine –
- Kingdom of Leinster – Dúnlaing mac Muiredaig (863–869)
- Kingdom of Mide
- Lorcán mac Cathail (862–864)
- Donnchad mac Aedacain (864–877)
- Kingdom of Munster – Cenn Fáelad hua Mugthigirn (861–872)
- Kingdom of Osraige – Cerball mac Dúnlainge (842–888)
- Kingdom of Ulaid –
- Cathalán mac Indrechtaig, co-king (857–871)
- Lethlobar mac Loingsig, co-king (857–873)
- Kingdom of Italy – Louis II (855–875)
- Principality of Benevento – Adelchis (854–878)
- County of Capua – Landulf II (863–879)
- March of Friuli – Unruoch III (863–874)
- Duchy of Gaeta – Constantine, Hypatus of Gaeta (839–866)
- Duchy of Naples –
- Sergius I (840–864)
- Gregory III (864–870)
- Papal States – Pope Nicholas I (858–867)
- Principality of Salerno – Guaifer (861–880)
- Duchy of Spoleto –Lambert I (860–871)
- March of Tuscany – Adalbert I (847–886)
- Republic of Venice –
- Pietro Tradonico, Doge of Venice (836–864)
- Orso I Participazio, Doge of Venice (864–881)
- Kingdom of Lotharingia – Lothair II (855–869)
- Great Moravia – Rastislav (846–870)
- Novgorod – Rurik, Prince of Novgorod (862–879)
- Scotland
- Kingdom of the Picts – Constantine I (862–877)
- Principality of Serbia – Mutimir, Grand Župan (850–891)
- Spain –
- County of Aragon – Galindo Aznárez I (844–867)
- Kingdom of Asturias – Ordoño I (850–866)
- County of Castile – Rodrigo (860–873)
- Emirate of Córdoba – Muhammad I (852–886)
- Kingdom of Pamplona – García Íñiguez (851/852–882)
- Wales –
- Kingdom of Gwynedd – Rhodri Mawr (844–878)
- Kingdom of Powys – Rhodri Mawr (855–878)