Skopje

City · c. 682 CE · in Europe

Capital of First Bulgarian Empire (682–1017), Serbian Empire (1352–1371), Former Yugoslav Republic of Macedonia (1992–today).

Ohrid (c. 682 CE): Capital of First Bulgarian Empire (682–1017).
Veliki Preslav (c. 682 CE): Capital of First Bulgarian Empire (682–1017).
Pliska (c. 682 CE): Capital of First Bulgarian Empire (682–1017).
Palembang (c. 674 CE): Capital of Srivijaya (674–1293).
Bolgar (c. 674 CE): Capital of Volga Bulgaria (674–1235), Golden Horde (1294–1502).
Bolghar Gord (c. 674–1235 CE): Capital of Volga Bulgaria (674–1235).
Bilär (c. 674–1235 CE): Capital of Volga Bulgaria (674–1235).
Dubrovnik (700 CE): Capital of Republic of Ragusa (1385–1806).
Lamphun (c. 661 CE): Capital of Haripuñjaya (661–1292).
Maria Saal (c. 661 CE): Capital of Carantania (661–749).

Around the same time and place

Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
First Bulgarian Empire founded (681 CE): After defeating the Byzantines, Khan Asparukh founded the Bulgarian state south of the Danube, with its capital at Pliska.
Eraclea (c. 705 CE): Capital of Republic of Venice (705–742).
Chufut-Kale (500–1490 CE): Capital of Crimean Khanate (1450–1490).
Muslim conquest of the Maghreb (647–709 CE): Arab armies conquered Byzantine North Africa and the Berber lands over six decades, taking Carthage in 698 and reaching the Atlantic.
Kairouan (670 CE): Founded by the Arab general Uqba ibn Nafi as a base for the conquest of North Africa, it became a major centre of Islamic learning.
Greek fire (c. 672 CE): Incendiary weapon used by the Byzantine navy, reportedly invented by Kallinikos, which helped defend Constantinople against Arab sieges.