Tui

City · c. 911 CE · in Europe

Capital of Kingdom of Galicia (911–1125).

Kaesong (c. 911 CE): Capital of Taebong (911–918), Goryeo (922–1392).
Lugo (c. 911 CE): Capital of Kingdom of Galicia (911–1125).
Changsha (c. 911 CE): Capital of Southern Chu (911–951).
Regensburg (c. 911 CE): Capital of Kingdom of Germany (911–961), Holy Roman Empire (1594–1806), Holy Roman Empire Minor States (1594–1806), and 1 more.
Hangzhou (c. 911 CE): Capital of Wuyue (911–978).
Beijing (c. 911 CE): Capital of Yan Kingdom (911–914), Ming Dynasty (1375–1644), Empire of China (1916–1916), and 2 more.
Mahdia (c. 911 CE): Capital of Fatimid Caliphate (911–948), Zirid dynasty (1057–1148), Kingdom of Africa (1152–1160).
Fengxiang District (c. 911 CE): Capital of Qi Kingdom (911–924).
Bratislava (907 CE): Capital of Kingdom of Hungary (1526–1546).
Shangjing Linhuangfu (c. 916 CE): Capital of Liao Dynasty (916–1125).

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).
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.
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.
Porto Torres (c. 866 CE): Capital of Giudicato of Logudoro (866–1259).
Badajoz (875 CE): Capital of Taifa of Badajoz (1010–1151).
Burgos (884 CE): Capital of Kingdom of Castile (1065–1235).
Andorra la Vella (900 CE): Capital of Principality of Andorra (1815–today).