Andorra la Vella

City · 900 CE · in Europe

Capital of Principality of Andorra (1815–today).

Székesfehérvár (c. 900 CE): Capital of Principality of Hungary (900–999), Kingdom of Hungary (1000–1543).
Esztergom (c. 900 CE): Capital of Principality of Hungary (900–999), Kingdom of Hungary (1001–1256).
Benabarre (c. 900 CE): Capital of County of Ribagorza (900–1084).
Roda de Isábena (c. 900 CE): Capital of County of Ribagorza (900–1084).
Maragheh (c. 898 CE): Capital of Sajid Dynasty (898–929), Ilkhanate (1294–1335).
Pskov (903 CE): Capital of Pskov Republic (1348–1510).
Bratislava (907 CE): Capital of Kingdom of Hungary (1526–1546).
Jeonju (c. 892 CE): Capital of Hubaekje (892–935).
Kaesong (c. 911 CE): Capital of Taebong (911–918), Goryeo (922–1392).
Lugo (c. 911 CE): Capital of Kingdom of Galicia (911–1125).

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.
Palermo (c. 850 CE): Capital of Emirate of Sicily (850–1091), Kingdom of Sicily (1139–1266), Kingdom of the Two Sicilies (1815–1860).
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.
Sibenik (860 CE): Capital of Kingdom of Croatia (926–1098).
Brunswick (861 CE): Capital of Duchy of Brunswick (1815–1870).
Mission of Cyril and Methodius (863 CE): Byzantine brothers sent as missionaries to Great Moravia, who created the Glagolitic alphabet and translated the liturgy into Old Church Slavonic.