Jiankang

City · c. 426 CE · in Central Asia

Capital of Liu Song Dynasty (426–479), Southern Qi (480–502), Chen Dynasty (561–589).

Braga (c. 414 CE): Capital of Kingdom of the Suebi (414–585), Kingdom of Galicia (911–1125).
Hippo Regius (c. 439 CE): Capital of Vandal Kingdom (439–439).
Lyon (c. 443 CE): Capital of Burgundian Kingdom (443–534).
Turkistan (401 CE): Capital of Kazakh Khanate (1599–1729).
Soba (400–1504 CE): Capital of Alodia (600–1504).
Faras (c. 400–650 CE): Capital of Nobatia (400–650).
Zhangye (c. 397 CE): Capital of Northern Liang (397–439).
Ravenna (c. 395 CE): Capital of Western Roman Empire (395–476), Ostrogothic Kingdom (500–553).
Mediolanum (c. 395–402 CE): Capital of Western Roman Empire (395–402).
Lanzhou (c. 387 CE): Capital of Western Qin (387–431).

Around the same time and place

Silla (c. 57 BCE – c. 935 CE): Kingdom with its capital at Gyeongju, traditionally founded in 57 BCE, that unified most of Korea in the 7th century.
Goguryeo (c. 37 BCE – c. 668 CE): Kingdom traditionally founded by Jumong in 37 BCE that grew to rule northern Korea and Manchuria.
Baekje (c. 18 BCE – c. 660 CE): Kingdom in southwestern Korea, traditionally founded in 18 BCE, a conduit of culture and Buddhism to Japan.
Gyeongju (c. 378 CE): Capital of Silla (378–681), Unified Silla (682–892).
Admonitions Scroll (c. 400 CE): Painted handscroll illustrating a text on the conduct of court ladies, attributed to Gu Kaizhi of the Eastern Jin capital at Nanjing; the surviving version, probably a later copy, is in the British Museum.
Stirrup (Feng Sufu tomb) (415 CE): The tomb of the Northern Yan official Feng Sufu, dated 415, contains the oldest surviving pair of metal-covered stirrups.
Gwanggaeto the Great (374 CE – 413 CE): King of Goguryeo whose conquests greatly expanded the kingdom in Manchuria and Korea.
Battle of Fei River (383 CE): Eastern Jin forces defeated a much larger army of the Former Qin, preserving the southern dynasties.