Tiaret

City · c. 778 CE · in Europe

Capital of Rustamid dynasty (778–909).

Dali (c. 779 CE): Capital of Nanzhao (779–902), Kingdom of Dali (947–1253).
Aachen (c. 768 CE): Capital of Kingdom of the Franks (768–843), Middle Franks (855–899), Holy Roman Empire (962–1346), and 1 more.
Fez (789 CE): Capital of Idrisids (793–974), Marinid Sultanate (1250–1465), Wattasid dynasty (1472–1554), and 1 more.
Naples (c. 763 CE): Capital of Duchy of Naples (763–1137), Kingdom of Sicily (1266–1282), Kingdom of Naples (1285–1805), and 2 more.
Koumbi Saleh (c. 793–1200 CE): Capital of Ghana Empire (793–1200).
Kyoto (Heian-kyo) (794 CE): Emperor Kanmu moved the capital to Heian-kyo, which remained Japan's imperial capital until 1868.
Nekor (c. 760 CE): Capital of Emirate of Nekor (760–1019).
Córdoba (c. 757 CE): Capital of Emirate of Córdoba (757–929), Caliphate of Córdoba (936–1031).
Shangjing Longquanfu (c. 756–785 CE): Capital of Balhae (756–785).
Prague (800 CE): Capital of Duchy of Bohemia (896–1002), Kingdom of Bohemia (1202–1528), Holy Roman Empire (1346–1611), and 4 more.

Around the same time and place

Trans-Saharan trade (c. 700–1600 CE): Camel caravans crossed the Sahara between Morocco and the Niger bend, exchanging North African goods and Saharan salt from mines such as Taghaza for West African gold, enriching the empires of Ghana, Mali and Songhai.
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.
Battle of Tours (732 CE): Frankish forces under Charles Martel defeated an Umayyad army between Tours and Poitiers, halting Arab expansion into Gaul.
Coronation of Charlemagne (800 CE): Pope Leo III crowned Charlemagne emperor in St Peter's Basilica on Christmas Day, reviving the imperial title in the West.
Great Mosque of Córdoba (785 CE): Mosque begun by Abd al-Rahman I in 785, famous for its forest of double-arched columns; it was converted into a cathedral in 1236.
Volubilis (400 BCE – 1710 CE): Capital of Mauretania (212 BCE–42), Idrisids (793–974).
Malamocco (c. 742 CE): Capital of Republic of Venice (742–810).
Temsamane (c. 750 CE): Capital of Emirate of Nekor (750–760).