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

*Bohai/Balhae - Da Xuanxi/Dae Hyeon-seok, King of Bohai/Balhae (871-895)
*Byzantine Empire - Basil I the Macedonian (Βασίλειος Α'), (867 - 886)
*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)
*Silla - Heongang, King of Silla (875-886)

Europe

*al-Andalus - Muhammad I, Umayyad Emir of Córdoba (852-886)
*Aragón - Aznar II Galíndez, Count of Aragón (867–893)
*Asturias - Alfonso III the Great, King of Asturias (866-910)
*Auvergne - Bernard II, Count of Auvergne (864-886)
*Auxerre - Hugh the Abbot, Count of Auxerre (876-886)
*Bavaria - Carloman of Bavaria, King of Bavaria (876-880)
*Brittany - Alan the Great, Duke of Brittany (877-907) disputed with Judicael, Duke of Brittany (877-888)
*Bulgaria - Boris I Michael, King of Bulgaria (852-889)
*Byzantine Empire - Basil I the Macedonian (Βασίλειος Α'), (867 - 886)
*Danelaw - Guthrum, King of the Danelaw (854–890)
**East Anglia¹ - Aethelred, King of East Anglia (876–879)
**Jórvík - Halfdan I, King of Jórvík (875-883)
**Mercia¹ - Ceolwulf II, King of Mercia (873–879)
**Northumbria^{1 - 2} - Ecgberht II, King of Northumbria (876–878)
*Denmark - Sigurd Orm i Øje, King of Denmark (873-903³)
*England - Alfred the Great, King of England (871-899)
*Friesland - Rorik, King of the Danish Vikings in Friesland (850-880)
*Gascony - Sancho I Mitarra, King of Gascony (872-?⁴)
*Great Moravia - Svatopluk I, King of Great Moravia (871–894)
*Iceland - Ingólfur Arnarson, King of Iceland (874-c.900⁵)
*Ireland - Flann Sinna, High King of Ireland (877-914)
*Italy - Carloman of Bavaria, King of Italy (877-879)
*León - Alfonso III of Leon, King of León (838-910)
*Navarre - García II Jiménez, King of Navarre (870–882)
*Norway - Harald I Fairhair, King of Norway (872-930)
*Papal States - John VIII, Pope (872-882)
*Poitiers - Ranulf II, Count of Poitiers (866-890)
*Saxony - Louis the Younger, King of Saxony (876-882)
*Scotland -
*#Aedh MacRunn, King of Scots and Picts (877-878)
*#Eochaid, King of Scots and Picts (878-889) jointly with Giric, King of Scots and Picts (878-889)
*Strathclyde
*#Rhun f Arthgal, King of Strathclyde (871-878)
*#Eochaid, King of Strathclyde (878-c.889)
*Swabia - Charles the Fat, King of Swabia (876-887)
*Venice - Orso I Participazio, Doge of Venice (864-881)
*Wales -
*#Rhodri "Mawr" ap Merfyn, King of Gwynedd (844-878)
*#Anarawd ap Rhodri, King of Gwynedd (878-916)
*Western Francia - Louis II, King of Western Francia (877-879)

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)

Notes

#Northumbria, East Anglia and Mercia had ceased to be autonomous and independent kingdoms by this time.
#Northumbria subsumed into the Norse Kingdom of Jórvík ca. 878.
#The date reigns of Sigurd Orm i Øje, as well as his actual existence, is controversial though East Anglian coins exist featuring him.
#Date of the end of Sancho I's reign is uncertain. Sancho II may have been monarch by 875.
#Name and dates from [http://www.hostkingdom.net/scand.html this website]