Saigon

City · 1862–1976 CE · in Southeast Asia

Capital of French Indochina (1887–1954).

Dar es Salaam (1862 CE): Capital of Tanzania (1964–1996).
Turin (c. 1861 CE): Capital of Kingdom of Italy (1861–1865).
Dessau (c. 1863–2007 CE): Capital of Duchy of Anhalt (1863–1870).
Vladivostok (1860 CE): Capital of Provisional Priamurye Government (1922–1922).
Praia (1858 CE): Capital of Republic of Cabo Verde (1976–today).
Kuala Lumpur (1857 CE): Capital of Federation of Malaya (1958–1962), Malaysia (1963–today).
Budapest (c. 1867 CE): Capital of Hungarian Nationalists (1867–1918), Austria-Hungary (1868–1918), Hungarian Republic (1919–1943), and 1 more.
Ras Hafun (c. 1856 CE): Capital of Majeerteen Sultanate (1856–1889).
Tokyo (1868 CE): Capital of Empire of Japan (1943–1945), Japan (1953–today).
Ottawa (1855 CE): Capital of Canada (1932–today).

Around the same time and place

Ho Chi Minh (1890 CE – 1969 CE): Vietnamese revolutionary who led the Viet Minh independence movement, declared the Democratic Republic of Vietnam in 1945 and led North Vietnam until his death.
Vietnam War (1955–1975 CE): War between communist North Vietnam and the US-backed South, which escalated into large-scale American intervention and ended with the fall of Saigon in 1975.
Cambodian genocide (1975–1979 CE): Under Pol Pot's Khmer Rouge, an estimated 1.5 to 2 million Cambodians died from execution, forced labour and starvation.
2004 tsunami (2004 CE): A magnitude 9.1–9.3 earthquake off Sumatra on 26 December 2004 generated tsunamis that killed about 230,000 people in 14 countries, most of them in Aceh.
Founding of modern Singapore (1819 CE): Stamford Raffles established a British trading post at Singapore in 1819, which grew into a major free port.
Pol Pot (1925 CE – 1998 CE): Leader of the Khmer Rouge and of Democratic Kampuchea from 1975 to 1979, whose regime was responsible for the Cambodian genocide.
Fall of Singapore (1942 CE): Surrender of the British garrison of Singapore to Japan on 15 February 1942, the largest capitulation in British military history.
First Indochina War (1946–1954 CE): War between France and the Viet Minh for control of Vietnam, ending with the Geneva Accords that partitioned the country.