Wikipedia:Selected anniversaries/May 28
This is a list of selected May 28 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.
May 28: Vesak (Buddhism, 2010); Republic Day in Armenia and Azerbaijan
- 1588 – Anglo-Spanish War: The Spanish Armada (a galleass pictured), with 130 ships and over 30,000 men, set sail from Lisbon for the English Channel in an attempt to invade England.
- 1644 – English Civil War: Royalist troops allegedly slaughtered up to 1,600 people during their storm and capture of the Town of Bolton.
- 1892 – Aided by a group of professors from the University of California, Berkeley and Stanford University, Preservationist John Muir founded the environmental organization Sierra Club in San Francisco.
- 1936 – English mathematician Alan Turing submitted his paper "On Computable Numbers, with an Application to the Entscheidungsproblem" for publication, introducing the Turing machine, a basic abstract symbol-manipulating device that can simulate the logic of any computer algorithm.
- 1975 – Sixteen West African countries signed the Treaty of Lagos, establishing the Economic Community of West African States to promote economic integration.