Quy Nhon

City · c. 1778 CE · in Southeast Asia

Capital of Tây Son dynasty (1778–1789).

Seremban (c. 1775 CE): Capital of Negeri Sembilan (1775–1894).
Georgetown (1781 CE): Capital of Guyana (1967–today).
Maputo (1781 CE): Capital of Mozambique (1976–today).
Bangkok (1782 CE): King Rama I founded the Chakri dynasty and moved the Siamese capital to Rattanakosin Island in 1782; Bangkok is now Thailand's capital.
Windsor (c. 1783 CE): Capital of Vermont Republic (1783–1790).
Bukittinggi (1784 CE): Capital of Republic of Indonesia (1948–1950).
Pontianak (1771 CE): Capital of Pontianak Kadriyah Sultanate (1772–1827).
Reykjavík (1786 CE): Capital of Kingdom of Iceland (1918–1939), Republic of Iceland (1946–today).
Washington, D.C. (1790 CE): Federal capital of the United States, created by the Residence Act of 1790 on the Potomac River and designed by Pierre L'Enfant.
Danville (1792 CE): Capital of Confederate States of America (1861–1865).

Around the same time and place

Ayutthaya (1351–1767 CE): Capital of the Siamese kingdom of Ayutthaya, founded in 1351, which became one of the largest and most cosmopolitan cities in Asia before it was destroyed by Burmese forces in 1767.
Manila galleon (western Pacific) (1565–1815 CE): For 250 years Spanish galleons sailed once or twice a year between Manila and Acapulco, exchanging Mexican silver for Chinese silk and porcelain; westbound ships called at Guam, and eastbound ships rode the westerlies across the North Pacific.
Kota Bharu (c. 1762 CE): Capital of Kelantan (1762–1904).
Kuching (1827 CE): Capital of Kingdom of Sarawak (1842–1946).
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.
Portuguese settlement of Macau (c. 1557–1999 CE): Ming authorities allowed Portuguese traders to settle at Macau, which became Europe's longest-held outpost in East Asia.
Canton System (1757–1842 CE): Qing policy restricting Western trade to Guangzhou under licensed Chinese merchants, the Cohong.
Nguyễn dynasty (1802–1945 CE): Last imperial dynasty of Vietnam, founded by Gia Long in 1802 with its capital at Huế; its last emperor, Bao Dai, abdicated in 1945.