Ribe

City · 800 CE · in Europe

Capital of North Sea Empire (1018–1035).

Prague (800 CE): Capital of Duchy of Bohemia (896–1002), Kingdom of Bohemia (1202–1528), Holy Roman Empire (1346–1611), and 4 more.
Yasodharapura (c. 802–1431 CE): Capital of Khmer Empire (802–1431).
Hariharalaya (c. 802–1431 CE): Capital of Khmer Empire (802–1431).
Kyoto (Heian-kyo) (794 CE): Emperor Kanmu moved the capital to Heian-kyo, which remained Japan's imperial capital until 1868.
Koumbi Saleh (c. 793–1200 CE): Capital of Ghana Empire (793–1200).
Fez (789 CE): Capital of Idrisids (793–974), Marinid Sultanate (1250–1465), Wattasid dynasty (1472–1554), and 1 more.
Nitra (c. 814 CE): Capital of Principality of Nitra (814–839).
Mashhad (818 CE): Capital of Afsharid Iran (1736–1756).
Dali (c. 779 CE): Capital of Nanzhao (779–902), Kingdom of Dali (947–1253).
Tiaret (c. 778 CE): Capital of Rustamid dynasty (778–909).

Around the same time and place

Charlemagne (c. 747 CE – 814 CE): King of the Franks who conquered much of Western Europe, was crowned emperor in 800 and promoted a revival of learning, the Carolingian Renaissance.
Viking raid on Lindisfarne (793 CE): Viking raid on the monastery of Lindisfarne in Northumbria, conventionally taken as the beginning of the Viking Age.
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
Aachen (c. 768 CE): Capital of Kingdom of the Franks (768–843), Middle Franks (855–899), Holy Roman Empire (962–1346), and 1 more.
Book of Kells (c. 800 CE): Lavishly illuminated Gospel book, probably begun at Iona and kept for centuries at the abbey of Kells; a masterpiece of Insular art.
Treaty of Verdun (843 CE): Treaty dividing the Carolingian Empire among three grandsons of Charlemagne, roughly foreshadowing France, Germany and Italy.
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.
Ardagh Chalice (c. 750 CE): An 8th-century Irish chalice of silver decorated with gold filigree, enamel and glass, found in 1868 in a ringfort near Ardagh, County Limerick. It is in the National Museum of Ireland in Dublin.