December 17
day of the year
December 17 is the 351st day of the year (352nd in leap years) in the Gregorian calendar; 14 days remain until the end of the year.
Events
Pre-1600
497 BC – The first Saturnalia festival is celebrated in ancient Rome.
546 – Siege of Rome: The Ostrogoths under king Totila plunder the city, by bribing the Eastern Roman garrison.
920 – Romanos I Lekapenos is crowned co-emperor of the underage Constantine VII.
942 – Assassination of William Longsword, Count of Normandy.
1297 – King Kyawswa of Pagan is overthrown by the three Myinsaing brothers, marking the de facto end of the Pagan Kingdom.
1354 – Margaret II, Countess of Hainaut and Holy Roman Empress and her son William I, Duke of Bavaria, sign a peace treaty ending the Hook and Cod wars.
1398 – Sultan Nasir-u Din Mehmud's armies in Delhi are defeated by Timur.
1538 – Pope Paul III excommunicates Henry VIII of England.
1583 – Cologne War: Forces under Ernest of Bavaria defeat troops under Gebhard Truchsess von Waldburg at the Siege of Godesberg.
1586 – Go-Yōzei becomes Emperor of Japan.
“December 17” enters the record as day of the year. Crown Archives preserves that source wording while asking what December and year can confirm, complicate or overturn.
Why this record matters
“December 17” is worth following because a concise public description often conceals a longer documentary argument. Here, December and year provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q2413. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1600, 1297, 1354 and 1398.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. 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
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
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Three-step research path
- Establish the record: confirm the title “December 17”, its source revision and the description used here.
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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 “December 17” 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.