List of state leaders in 878

877 state leaders - Events of 878 - 879 state leaders - State leaders by year

Africa

• Egypt - Ahmad ibn Tulun, Tulunid Emir of Egypt (868–884)
• Ifriqiya - "Abu Ishaq" Ibrahim II ibn Ahmad, Aghlabid Emir of Ifriqiya (875–902)
• Morocco - Ali ibn Umar, known as "Ali II", Idrisid Caliph of Morocco (874–883)
• Nekor - Said II ibn Salih, Salihid Emir of Nekor (c.864-c.916)
• Tahert - Muhammad Abu'l-Yaqdan, Rustamid Imam of Tahert (c.873-c.894)
• Tamesna - Yunus, Tarifid King of the Berghouata (842–888)

Asia

• China (Tang Dynasty) - Xizong, Emperor of Tang China (873–888)
• Gurjara - Mihira Bhoja I, Pratihara King of Gurjara (c. 836–886)
• Japan -
  • Monarch - Emperor Yōzei, emperor of Japan (876–884)
  • Regent (Sessho) - Fujiwara no Mototsune, Sessho (876–884)
• Korea (North South States Period)
  • Balhae - Dae Hyeonseok, King of Balhae (871–893)
  • Silla - Heongang, King of Silla (875–886)

Europe

• Bulgaria - Boris I, Knyaz of Bulgaria (852–889)
• Byzantine Empire - Basil I (867–886)
• Caucasus
  • Principate of Iberia - David I (876–881)
  • Principality of Kakheti - Gabriel, Prince of Kakheti (861–881)
  • Klarjeti - Sumbat I Mampali, Prince of Klarjeti (c. 870–889)
• Littoral Croatia -
  1. Iljko, Duke of Littoral Croatia (876–878)
  2. Zdeslav, Duke of Littoral Croatia (878–879)
• England (Heptarchy) -
  • Danelaw - Guthrum, King of the Danish Vikings (c. 874–c. 890)
    • Kingdom of East Anglia - Aethelred (876–879)
    • Mercia - Ceolwulf II, King of Mercia (874–c. 881)
    • Northumbria -
      1. Ecgberht II, King of Northumbria (876–c. 878)
      2. Guthred, King of Northumbria (878–895)
  • Wessex - Alfred the Great, King of Wessex (871–899)
• East Francia -
  • Duchy of Alsace - Hugh, Duke of Alsace (867–885)
  • Bavaria – Carloman of Bavaria, King of Bavaria (876–880)
  • March of Pannonia - Aribo of Austria (871–909)
  • Saxony – Louis the Younger, King of Saxony (876–882)
  • Duchy of Saxony - Brun, Duke of Saxony (866–880)
  • Swabia – Charles the Fat, King of Swabia (876–887)
  • Thuringia - Radulf II, Duke of Thuringia (874–880)
• West Francia - Louis the Stammerer, King of West Francia (877–879)
  • County of Angoulême - Wulgrin I (866–886)
  • County of Auvergne - Bernard II (872–886)
  • County of Auxerre - Hugh the Abbot (876–886)
  • County of Barcelona -
    1. Bernard II (865–878)
    2. Wilfred the Hairy (878–897)
  • Duchy of Brittany - Two opposing claimants:
    • Judicael (876–888/889)
    • Alan I (876–907)
  • County of Flanders -
    1. Baldwin I (862–879)
    2. Baldwin II (879–918)
  • County of Maine -
    1. Gosfrid (865–878)
    2. Ragenold (878–885)
  • March of Neustria -
    1. Gosfrid of Maine (865–878)
    2. Ragenold (878–885)
  • Poitiers - Ranulf II of Aquitaine, Count of Poitiers (877–890)
  • County of Toulouse - Bernard Plantapilosa (877–886)
  • Tours - Hugh the Abbot, Count of Tours (866–886)
  • Troyes - Robert I, Count of Troyes (876–886)
  • County of Urgell - Wilfred the Hairy (870–897)
• Gascony - 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 - Conchobar mac Taidg Mór, King of Connacht (872–882)
  • Uí Maine -
  • Leinster -
  • Kingdom of Mide - Flann Sinna (877–916)
  • Munster - Dúnchad mac Duib-dá-Bairenn, King of Munster (872–888)
  • Kingdom of Osraige - Cerball mac Dúnlainge (842–888)
  • Ulaid - Ainbíth mac Áedo, King of Ulaid (873–882)
• Italy - Carloman of Bavaria, King of Italy (877–879)
  • Principality of Benevento -
    1. Adelchis (854–878)
    2. Guaifer (878–881)
  • County of Capua - Landulf II (863–879)
  • March of Friuli - Berengar (874–890)
  • Duchy of Gaeta - Docibilis I, Hypatus of Gaeta (866–906)
  • Duchy of Naples - Athanasius (877–898)
  • Papal States - Pope John VIII (872–882)
  • Principality of Salerno - Guaifer (861–880)
  • Duchy of Spoleto - Lambert I (876–880)
  • March of Tuscany - Adalbert I (847–886)
  • Republic of Venice - Orso I Participazio, Doge of Venice (864–881)
• Great Moravia - Svatopluk I, King of Great Moravia (870–894)
  • Duchy of Bohemia - Borivoj I (c. 870–c. 889)
• Norway - Harald I Fairhair, King of Norway (872–930)
• Novgorod - Rurik, Prince of Novgorod (862–879)
• Scotland -
  1. Áed, King of the Picts (877–878)
  2. Giric, King of the Picts (878–889), possibly together with Eochaid, King of the Picts (878–889)
• Serbia - Mutimir, Grand Zhupan of Serbia (850–891)
• Spain -
  • County of Aragon - Aznar Galíndez II (867–893)
  • Kingdom of Asturias - Alfonso III (866–910)
    • County of Castile - Diego Rodríguez Porcelos (872–c. 885)
  • Caliphate of Córdoba - Muhammad I (852–886)
  • County of Pallars - Raymond I (872–920)
  • Kingdom of Pamplona - García Íñiguez (851/852–882)
  • County of Ribagorza - Raymond I (872–920)
• Wales -
  • Kingdom of Gwynedd -
    1. Rhodri the Great (844–878)
    2. Anarawd ap Rhodri (878–916)
  • Kingdom of Powys -
    1. Rhodri the Great (855–878)
    2. Merfyn ap Rhodri (878–900)
  • Seisyllwg -
    1. Rhodri the Great, King of Seisyllwg (855–878)
    2. Cadell ap Rhodri, King of Seisyllwg (878–909)

Middle East

• Abbasid Caliphate - Al-Mu'tamid, Caliph (870–892)
• Byzantine Empire - Basil I the Macedonian (Βασίλειος Α'), (867–886)
• Sistan - Ya'qub bin Laith as-Saffar, Saffarid Emir of Sistan (867–879)
• Transoxiana - Nasr I ibn Ahmad, Samanid Emir of Transoxiana (864–892)