Wikipedia:Selected anniversaries/August 21
August 21: Ninoy Aquino Day in the Philippines.
- 1772 – A bloodless coup d'état led by Gustav III was completed with the adoption of a new Swedish Constitution.
- 1831 – Nat Turner led a slave revolt in Southampton County, Virginia, USA, but it was suppressed about 48 hours later.
- 1911 – Mona Lisa (pictured), an oil painting by Leonardo da Vinci, was stolen from the Louvre Museum in Paris. It was recovered two years later.
- 1963 – The Army of the Republic of Vietnam Special Forces loyal to Ngo Dinh Nhu, brother of President Ngo Dinh Diem, raided and vandalised Buddhist pagodas across the country, arresting thousands and leaving an estimated hundreds dead.
- 1976 – Operation "Paul Bunyan" was carried out in response to the Axe Murder Incident, almost triggering a second full-scale Korean War over cutting down a 100 ft (30 m) poplar tree in the Joint Security Area of the Korean Demilitarized Zone.
- 1986 – A limnic eruption from Lake Nyos in Cameroon killed up to 1,800 people and 3,500 livestock in nearby villages.
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