Rennes

City · c. 947 CE · in Europe

Capital of Duchy of Brittany (947–1491).

Nantes (c. 947 CE): Capital of Duchy of Brittany (947–1491).
Algiers (944 CE): Capital of Regency of Algiers (1706–1830), Free French (1940–1943), People's Democratic Republic of Algeria (1963–today).
Kaifeng (c. 951 CE): Capital of Later Zhou (951–960).
Vedeno (940 CE): Capital of Caucasian Imamate (1828–1858).
Thingvellir National Park (c. 936 CE): Capital of Icelandic Commonwealth (936–1262).
Isfahan (c. 936 CE): Capital of Ziyarid dynasty (936–979), Great Seljuk Empire (1040–1194).
Arles (c. 936 CE): Capital of Kingdom of Arles (936–1378).
Taiyuan (c. 936 CE): Capital of Later Jin (936–946), Northern Han (960–979).
Hyrcania (c. 936 CE): Capital of Ziyarid dynasty (936–979).
Ray (c. 936 CE): Capital of Ziyarid dynasty (936–979), Great Seljuk Empire (1040–1194).

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.
Founding of the Holy Roman Empire (962 CE): Pope John XII crowned Otto I emperor in Rome, the conventional start of the Holy Roman Empire, which lasted until 1806.
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.
Andorra la Vella (900 CE): Capital of Principality of Andorra (1815–today).
Bratislava (907 CE): Capital of Kingdom of Hungary (1526–1546).
Lugo (c. 911 CE): Capital of Kingdom of Galicia (911–1125).
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.