Burgos

City · 884 CE · in Europe

Capital of Kingdom of Castile (1065–1235).

Kars (c. 886 CE): Capital of Bagratid Armenia (886–1045).
Ani (c. 886–1319 CE): Capital of Bagratid Armenia (886–1045).
Bagaran (c. 886–1045 CE): Capital of Bagratid Armenia (886–1045).
Shirakavan (c. 886–1045 CE): Capital of Bagratid Armenia (886–1045).
Hotan (c. 888 CE): Capital of Kingdom of Khotan (888–1006).
Ardanuç (c. 888 CE): Capital of Kingdom of the Iberians (888–999).
Oltu (c. 888 CE): Capital of Kingdom of the Iberians (888–999).
Kediri (879 CE): Capital of Kediri Kingdom (1046–1221).
Jeonju (c. 892 CE): Capital of Hubaekje (892–935).
Badajoz (875 CE): Capital of Taifa of Badajoz (1010–1151).

Around the same time and place

Reconquista (718–1492 CE): Centuries-long series of campaigns by Christian kingdoms to take the Iberian Peninsula from Muslim rule, ending with the fall of Granada in 1492.
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
Treaty of Verdun (843 CE): Treaty dividing the Carolingian Empire among three grandsons of Charlemagne, roughly foreshadowing France, Germany and Italy.
Alfred the Great (849 CE – 899 CE): King of Wessex who defended his kingdom against the Vikings, reorganised its defences and promoted learning in English.
University of al-Qarawiyyin (859 CE): Founded by Fatima al-Fihri in Fez, it is often cited as the oldest continuously operating institution of higher learning in the world.
Great Heathen Army (865–878 CE): A large coalition of Scandinavian warriors landed in East Anglia in 865, took York, and conquered Northumbria, East Anglia and much of Mercia before Alfred the Great defeated Guthrum at Edington in 878.
Olbia (c. 866 CE): Capital of Giudicato of Gallura (866–1209).
Porto Torres (c. 866 CE): Capital of Giudicato of Logudoro (866–1259).