This is a list of selected May 5 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. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
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- Events listed on the Main Page are selected based on article quality and to provide a diverse range of topics, rather than solely on the importance or significance of the events.
- Only four or five events are featured each day; therefore, not all important or significant events can be included.
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May 5: Cinco de Mayo; Liberation Day in Denmark, Ethiopia, and the Netherlands; Children's Day in Japan and South Korea
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- 553 – The Second Council of Constantinople, considered by many Christian churches to have been the fifth Christian Ecumenical Council, began to discuss the topics of Nestorianism and Origenism, among others.
- 1789 – The Estates-General convened in Versailles to discuss a financial crisis in France, triggering a series of events that led to the French Revolution.
- 1949 – Ten European countries signed the Treaty of London, creating the Council of Europe, today one of the oldest international organisations working for European integration.
- 1950 – Prince Bhumibol Adulyadej (pictured) was crowned in Bangkok as King Rama IX of Thailand, currently the world's longest-serving head of state.
- 1994 – Armenia and Azerbaijan signed the Bishkek Protocol, a provisional ceasefire treaty to end hostilities in the Nagorno-Karabakh War, with both sides agreeing, among others, to grant a wide-ranging autonomy to the Nagorno-Karabakh region.