Wikipedia:Selected anniversaries/June 23
This is a list of selected June 23 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.
To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.
June 23: Jaaniõhtu and Victory Day in Estonia; Jāņi in Latvia; Saint Jonas' Festival in Lithuania; Grand Duke's Official Birthday in Luxembourg
- 1757 – Seven Years' War: British forces under Robert Clive defeated troops under Siraj ud-Daulah at the Battle of Plassey, allowing the British East India Company to annex Bengal.
- 1887 – The Parliament of Canada passed the Rocky Mountains Park Act, creating Banff National Park (pictured) as Canada's first national park.
- 1894 – Led by French historian Pierre de Coubertin, an international congress at the Sorbonne in Paris founded the International Olympic Committee to reinstate the ancient Olympic Games.
- 1919 – Estonian War of Independence: Estonian troops engaged the forces of the Pro-German Government of Latvia near Cēsis, Latvia, recapturing the area four days later.
- 1946 – Canada's largest onshore earthquake, measuring 7.3 Mw, struck Vancouver Island, but only caused two casualties since there were no heavily populated areas near its epicenter.
- 1961 – The Antarctic Treaty, which sets aside Antarctica as a scientific preserve and bans military activity on the continent, came into force.