Gdańsk

City · 997 CE · in Europe

Capital of Free City of Danzig (1920–1939).

Wroclaw (1000 CE): Capital of Duchy of Silesia (1139–1304), Duchy of Wroclaw (1169–1201).
Cagliari (c. 1000 CE): Capital of Giudicato of Cagliari (1000–1187).
Buda (c. 1000 CE): Capital of Kingdom of Hungary (1000–1526), Eastern Hungarian Kingdom (1529–1541).
Sant Martí d'Empúries (c. 1000 CE): Capital of County of Ampuria (1000–1078).
Dijon (c. 1003 CE): Capital of Duchy of Burgundy (1003–1477).
Bruges (c. 990 CE): Capital of County of Flanders (990–1384).
Le Mans (c. 990 CE): Capital of County of Maine (990–1481).
Blois (c. 990 CE): Capital of County of Blôis (990–1401).
Rodez (c. 990 CE): Capital of County of Rouergue (990–1065).
Vladimir (990 CE): Capital of Principality of Rostov-Suzdal (1125–1240), Principality of Vladimir-Suzdal (1294–1389).

Around the same time and place

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.
Christianization of Kievan Rus' (988 CE): Vladimir the Great adopted Orthodox Christianity from Byzantium and had the people of Kyiv baptised in the Dnieper.
William the Conqueror (c. 1028 CE – 1087 CE): Duke of Normandy who conquered England in 1066 and became its first Norman king.
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
Varangians to the Greeks (c. 800–1100 CE): Scandinavian traders and warriors travelled from the Baltic up the Neva and Volkhov past Novgorod, portaged to the Dnieper and sailed down past Kiev to the Black Sea and Constantinople.
Otto the Great (912 CE – 973 CE): German king who defeated the Magyars and was crowned emperor in Rome in 962; he was buried in Magdeburg.
Luxembourg (963 CE): Capital of Duchy of Luxembourg (1429–1449).
Copenhagen (c. 965 CE): Capital of Kingdom of Denmark (965–1406), Kalmar Union (1443–1523), Denmark-Norway (1536–1814).