September 11
day of the year
September 11 is the 254th day of the year (255th in leap years) in the Gregorian calendar; 111 days remain until the end of the year.
Events
Pre-1600
9 – The Battle of the Teutoburg Forest ends: The Roman Empire suffers the greatest defeat of its history and the Rhine is established as the border between the Empire and the so-called barbarians for the next four hundred years.
911 – William I of Aquitaine gifts abbot Berno a group of lands close to Mâcon to found a new monastery. Contrary to other Benedictine monasteries, William sets the monastery outside of the control of any feudal lord.
1185 – Isaac II Angelos kills Stephen Hagiochristophorites and then appeals to the people, resulting in the revolt that deposes Andronikos I Komnenos and places Isaac on the throne of the Byzantine Empire.
1275 – An earthquake occurs in the south of Great Britain, notably causing multiple fatalities as well as destroying St Michael's Church on Glastonbury Tor.
1297 – Battle of Stirling Bridge: Scots jointly led by William Wallace and Andrew Moray defeat the English.
1390 – Lithuanian Civil War (1389–1392): The Teutonic Knights begin a five-week siege of Vilnius.
1541 – Santiago, Chile, is attacked by indigenous warriors, led by Michimalonco, to free eight indigenous chiefs held captive by the Spaniards.
1565 – Ottoman forces retreat from Malta ending the Great Siege of Malta.
“September 11” enters the record as day of the year. Crown Archives preserves that source wording while asking what September and year can confirm, complicate or overturn.
Why this record matters
“September 11” is worth following because a concise public description often conceals a longer documentary argument. Here, September and year provides the most credible route into that argument.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 21, 2026. The linked authority identifier is Q2851. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1600, 1185, 1275 and 1297.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
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- Subject orientation
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Three-step research path
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- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “September 11” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.