Wikipedia:Selected anniversaries/September 23

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This is a list of selected September 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 five to six 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.

< September 22 September 24 >

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Blurb Reason
1123Pope Callixtus II and Holy Roman Emperor Henry V agreed to the Concordat of Worms to put an end to the Investiture Controversy. unreferenced section, lots of CN tags
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 section
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. 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. Neptune is POTD for 2019
1875Billy the Kid (pictured) was arrested for the first time after stealing clothes from a laundryman, beginning his life as an infamous American outlaw and gunman. Hook contradicts the article lede, which says his first arrest was for stealing food. It also says the laundry incident was ten days after the 16th September, which isn't today
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 Hejaz and Nejd 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
1983 – A bomb placed by the Abu Nidal organisation destroyed Gulf Air Flight 771, flying from Karachi, Pakistan, to Abu Dhabi, UAE, killing all 112 people aboard. expansion
El Santo (b. 1917) refimprove section
Bruce Springsteen (b. 1949) refimprove


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

Nixon delivering the Checkers speech
Nixon delivering the Checkers speech

John Ainsworth Horrocks (d. 1846) · Kostas Tournas (b. 1949) · Michiru Yamane (b. 1963)

More anniversaries: