Wikipedia:Selected anniversaries/September 23

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This is a list of selected September 23 anniversaries that appears on 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 soon will 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 5–6 events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is not generally posted this year if it is also the subject of the scheduled September 23, 2018 featured article or the September 23, 2018 featured picture.

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.

< September 22 September 24 >

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Blurb Reason
Santo (b. 1917) refimprove
1123Pope Calixtus II and Holy Roman Emperor Henry V agreed to the Concordat of Worms to put an end to the Investiture Controversy. refimprove
1459Yorkist forces led by Richard Neville defeated Lancastrian troops at the Battle of Blore Heath in Staffordshire, England, a major battle of the Wars of the Roses. refimprove secion
1779American Revolutionary War: John Paul Jones led a Franco-American squadron to victory in the Battle of Flamborough Head, one of the most celebrated naval actions of the war. rewrite, primary
1845 – American bookseller Alexander Cartwright founded the New York Knickerbockers, one of the first organized baseball teams, as well as formalizing a set of rules that became the basis for the rules of the modern game. needs more footnotes
1846 – Using mathematical predictions by French mathematician Urbain Le Verrier, German astronomer Johann Gottfried Galle became the first person to observe Neptune and recognise it as a hitherto unknown planet. neutrality issues
1889Fusajiro Yamauchi founded Nintendo in Kyoto, Japan, to produce handmade hanafuda cards. expansion
1899Philippine–American War: The American Asiatic Squadron destroyed a Filipino artillery battery in Olongapo. one source
1932 – The Kingdom of Nejd and Hejaz merged with Al-Hasa and Qatif to form the Kingdom of Saudi Arabia, with Ibn Saud as the first monarch and Riyadh as the capital city. refimprove


September 23: Celebrate Bisexuality Day; National Day in Saudi Arabia (1932)

Benedict Arnold
Benedict Arnold

Vincenzo Bellini (d. 1835) · Louise Nevelson (b. 1899) · Cherie Blair (b. 1954)

More anniversaries:
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