Gungnae

City · c. 3–427 CE · in Central Asia

Capital of Goguryeo (3–427).

Kabalaka (c. 2 BCE – c. 461 CE): Capital of Caucasian Albania (2 BCE–461).
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
León (29 BCE): Capital of Kingdom of Galicia (911–1111), Kingdom of León (911–1235).
Jolbon (c. 36 BCE): Capital of Goguryeo (36 BCE–3).
Bagram (c. 43 CE): Capital of Kushan Empire (43–237), Eastern Kushans (238–346), Western Kushans (238–259).
Erbil (c. 63 BCE): Capital of Kingdom of Adiabene (63 BCE–370).
Mtskheta (c. 63 BCE): Capital of Caucasian Iberia (63 BCE–533).
Tbilisi (c. 63 BCE): Capital of Caucasian Iberia (63 BCE–533), Principality of Iberia (682–740), Kingdom of Georgia (1122–1466), and 1 more.
Samosata (c. 63 BCE – c. 72 CE): Capital of Kingdom of Commagene (63 BCE–72).
Armaztsikhe (c. 63 BCE – c. 533 CE): Capital of Caucasian Iberia (63 BCE–533).

Around the same time and place

Papermaking improved by Cai Lun (105 CE): The court official Cai Lun presented an improved process for making paper from bark, hemp and rags; earlier paper fragments date to the 2nd century BCE.
Chinese porcelain (c. 150 CE): True high-fired porcelain developed from celadon stoneware in the Yue kilns of Zhejiang during the Eastern Han dynasty.
Three Kingdoms period (220–280 CE): After the end of the Han, China was divided among the states of Wei, Shu and Wu.
Grand Canal (c. 609 CE): The world’s longest artificial waterway. The Sui dynasty joined older canals into a network by about 609 CE; the Yuan realigned it to run directly north to Beijing by 1293, the course it follows between Beijing and Hangzhou today.
Wu Zetian (624 CE – 705 CE): The only woman to rule China as emperor in her own right, proclaiming the Zhou dynasty (690–705) with Luoyang as her capital.
Yayoi period (c. 300 BCE – c. 300 CE): Era when wet-rice farming and metalworking spread to Japan from the continent; the Yoshinogari site is a major settlement.
Pyongyang (c. 197 BCE): Capital of Gojoseon (197 BCE–108 BCE), Goguryeo (427–668), Democratic People's Republic of Korea (1948–today), and 1 more.
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.