Guangzhou

City · c. 917 CE · in East Asia

Capital of Southern Han (917–971).

Shangjing Linhuangfu (c. 916 CE): Capital of Liao Dynasty (916–1125).
Liao Nanjing (c. 916–1153 CE): Capital of Liao Dynasty (916–1125).
Lindong Town (c. 918 CE): Capital of Liao Dynasty (918–938).
Rouen (c. 922 CE): Capital of Duchy of Normandy (922–1071).
Koh Ker (c. 922–944 CE): Capital of Khmer Empire (922–944).
Kaesong (c. 911 CE): Capital of Taebong (911–918), Goryeo (922–1392).
Lugo (c. 911 CE): Capital of Kingdom of Galicia (911–1125).
Changsha (c. 911 CE): Capital of Southern Chu (911–951).
Regensburg (c. 911 CE): Capital of Kingdom of Germany (911–961), Holy Roman Empire (1594–1806), Holy Roman Empire Minor States (1594–1806), and 1 more.
Hangzhou (c. 911 CE): Capital of Wuyue (911–978).

Around the same time and place

Tang dynasty (618–907 CE): The Tang dynasty, ruling from Chang'an, presided over a cosmopolitan golden age of poetry, Buddhism and trade.
Song dynasty (960–1279 CE): Founded by Zhao Kuangyin with its capital at Kaifeng, the Song saw a commercial revolution, paper money and advances in printing and science.
Imperial examination system (605–1905 CE): The Sui formalised civil service examinations for selecting officials, a system that lasted until its abolition in 1905.
Battle of Bach Dang (938) (938 CE): Ngô Quyền defeated a Southern Han fleet using iron-tipped stakes planted in the Bach Dang River, ending a millennium of Chinese rule over northern Vietnam.
Kaifeng (c. 951 CE): Capital of Later Zhou (951–960).
Champa (c. 192–1832 CE): Collection of Cham polities along the coast of central and southern Vietnam, founded around 192 CE and gradually absorbed by Dai Viet.
Hanlin Academy (738–1911 CE): Emperor Xuanzong of Tang founded the Hanlin Academy in Chang’an as a body of scholars who drafted imperial documents. Under later dynasties it became an elite institution of top examination graduates, lasting until 1911.
Co Loa Citadel (c. 256 BCE – c. 965 CE): Capital of Âu Lac (256 BCE–207 BCE), Ngô Dynasty (947–965).