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)
• Byzantine Empire - Michael III, (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)
• Korea (North South States Period)
  • Balhae - Dae Geonhwang, King of Balhae (857–871)
  • Silla - Gyeongmun, King of Silla (861–875)
• Rashtrakuta - Amoghavarsha I, King of Rashtrakuta
• Wethali - Paulataingsandra, King of Wethali, (849–875)

Europe

• Bulgaria - Boris I, Knyaz of Bulgaria (852–889)
• Byzantine Empire - Michael III (842–867)
• Caucasus
  • Principate of Iberia - Bagrat I Kuropalates, Prince of Iberia (830–876)
  • Principality of Kakheti - Gabriel, Prince of Kakheti (861–881)
• Littoral Croatia -
  1. Trpimir I, Duke of Littoral Croatia (845–864)
  2. Zdeslav, Duke of Littoral Croatia (864)
  3. Domagoj, Duke of Littoral Croatia (864–876)
• Kingdom of Denmark - Horik II (854–c. 866)
• England (Heptarchy) -
  • Kingdom of East Anglia - Edmund the Martyr (854–869)
  • Mercia - Burgred, King of Mercia (852–874)
  • Northumbria - Ælla, King of Northumbria (862/863–867)
  • Wessex - Æthelbert, King of Wessex (860–865)
• East Francia - Louis the German, King of East Francia (843–876)
  • Duchy of Saxony - Liudolf, Duke of Saxony (844–866)
  • Thuringia - Thakulf, Duke of Thuringia (849–873)
• West Francia - Charles the Bald, King of West Francia (843–877)
  • County of Angoulême - Emenon (863–866)
  • Anjou - Robert the Strong, Count of Anjou (861–866)
  • Duchy of Aquitaine - Ranulf I, Duke of Aquitaine (854–866)
  • Kingdom of Aquitaine -
    • Pepin II of Aquitaine, King of Aquitaine (854–864)
    • Charles the Child, King of Aquitaine (855–866)
  • County of Auxerre -
    1. Conrad I (859–864)
    2. Robert the Strong (864–866)
  • Barcelona - Humfrid, Count of Barcelona (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, Margrave of Neustria (861–865)
    • Udo, Margrave of Neustria (861–865)
    • Berengar I, Margrave of Neustria (861–865)
  • Poitiers - Ranulf I, Count of Poitiers (854–866)
  • County of Toulouse - Humfrid (863–865)
  • Tours - Robert the Strong, Count of Tours (860–866)
  • Troyes - Rudolph I, Count of Troyes (858–866)
  • Urgell - Solomon, Count of Urgell (848–869)
• Gascony -
  1. Sans II Sancion of Gascony, Duke of Gascony (836–864)
  2. Arnaut, Duke of Gascony (864)
  3. Sans III Mitarra, Duke of Gascony (864–893)
• Ireland - Áed Findliath, High King of Ireland (862–879)
  • Ailech - Áed Findliath, King of Ailech (c. 855–879)
  • Connacht - Mugron mac Máel Cothaid, King of Connacht (848–872)
  • Hy-Many -
  • Leinster - Dúnlaing mac Muiredaig, King of Leinster (863–869)
  • Mide -
    1. Lorcán mac Cathail, King of Mide (862–864)
    2. Donnchad mac Aedacain, King of Mide (864–877)
  • Munster - Cenn Fáelad hua Mugthigirn, King of Munster (861–872)
  • Osraige - Cerball mac Dúnlainge, King of Osraige (842–888)
  • Ulaid -
  • Cathalán mac Indrechtaig, Co-king of Ulaid (857–871)
  • Lethlobar mac Loingsig, Co-king of Ulaid (857–873)
• Italy - Louis II, King of Italy and Holy Roman Emperor (855–875)
  • Principality of Benevento - Adelchis, Prince of Benevento (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 -
    1. Sergius I (840–864)
    2. 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)
  • Venice -
    1. Pietro Tradonico, Doge of Venice (836–864)
    2. Orso I Participazio, Doge of Venice (864–881)
• Lotharingia - Lothair II, King of Lotharingia (855–869)
• Great Moravia - Rastislav, Prince of Great Moravia (846–870)
• Novgorod - Rurik, Prince of Novgorod (862–879)
• Scotland
  • Picts - Constantine I, King of the Picts (862–877)
• Serbia - Mutimir, Grand Zhupan of Serbia (850–891)
• Spain -
  • County of Aragon - Galindo Aznárez I (844–867)
  • Kingdom of Asturias - Ordoño I(850–866)
    • County of Castile - Rodrigo, Count of Castile (860–873)
  • Caliphate 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)