Canterbury

City · c. 490 CE · in Europe

Capital of Kingdom of Kent (490–762).

Kyiv (482 CE): Capital of Kievan Rus' (882–1240), Principality of Kiev (1056–1240), Ukrainian People's Republic (1919–1919).
Tournai (c. 481 CE): Capital of Kingdom of the Franks (481–508).
Pavia (c. 500 CE): Capital of Ostrogothic Kingdom (500–553).
Chufut-Kale (500–1490 CE): Capital of Crimean Khanate (1450–1490).
Old Dongola (c. 500–1518 CE): Capital of Makuria (500–1414), Makuria Kingdom (1415–1518).
Soissons (c. 476 CE): Capital of Kingdom of Soissons (476–486), Kingdom of Neustria (724–731).
Toulouse (c. 476 CE): Capital of Visigothic Kingdom (476–507), County of Toulouse (990–1249), Duchy of Aquitaine (990–1439).
Vallabhi (c. 476–1948 CE): Capital of Maitraka Dynasty (476–731).
Barcelona (c. 507 CE): Capital of Visigothic Kingdom (507–542), Catalonia (1640–1641), Second Spanish Republic (1932–1938).
Jabiyah (c. 510–633 CE): Capital of Ghassanids (510–633).

Around the same time and place

Fall of the Western Roman Empire (476 CE): The Germanic general Odoacer deposed Romulus Augustulus, the last Western Roman emperor, at Ravenna, a date conventionally marking the end of the Western Empire.
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
Attila (c. 406 CE – 453 CE): Ruler of the Huns who led devastating invasions of the Eastern and Western Roman Empires from his base on the Hungarian plain.
Lyon (c. 443 CE): Capital of Burgundian Kingdom (443–534).
Anglo-Saxon settlement of Britain (c. 450 CE): Angles, Saxons and Jutes from northern Germany and Denmark settled in lowland Britain, laying the foundations of England and the English language.
Clovis I (c. 466 CE – 511 CE): King who united the Franks, converted to Catholic Christianity and made Paris his capital.
Benedict of Nursia (c. 480 CE – 547 CE): Italian monk whose Rule for monasteries became the foundation of Western monasticism; he founded the abbey of Monte Cassino.
Winchester (c. 534 CE): Capital of Kingdom of Wessex (534–927), Kingdom of England (936–1100).