Editing 1818 (section)

=== October–December ===
* [[October 5]] – [[Claudine Thévenet]] (known as ''Mary of St. Ignatius'') founds the [[Roman Catholic]] order ''Religieuses de Jésus-Marie'' ("Religious of Jesus And Mary") in [[Lyon]], France.
* [[October 20]] – A [[Treaty of 1818|treaty]] between the U.S. and the United Kingdom establishes the boundary between the U.S. and [[British North America]] as the [[49th parallel north|49th parallel]], from the [[Lake of the Woods]] to the [[Rocky Mountains]], also creating the [[Northwest Angle]].
* [[November 11]] – [[Ying Wa College|Anglo-Chinese College]] is founded by [[Robert Morrison (missionary)|Robert Morrison]] in [[Malacca]] (later renamed Ying Wa College).
* [[November 16]] – The Saint Louis Academy, which later becomes [[Saint Louis University]], is founded by Reverend [[Louis William Valentine Dubourg]] in the United States.
* [[December 3]] – [[Illinois]] is admitted as the 21st [[U.S. state]].
* [[December 13]] – [[Cyril VI of Constantinople]] quits his place as an [[Ecumenical Patriarch of Constantinople|Ecumenical Patriarch]].
* [[December 24]] – The [[Christmas carol]] "[[Silent Night]]" (''Stille Nacht''), with words by the priest [[Josef Mohr]], set to music by organist [[Franz Xaver Gruber]], is first performed at St. Nikolaus Parish Church, in [[Oberndorf bei Salzburg]], Austria.