Editing 1631 (section)

=== October&ndash;December ===
* [[October 10]] &ndash; [[Thirty Years' War]]: A [[Saxony|Saxon]] army takes over [[Prague]]. 
* [[November 15]] &ndash; King Gustavus Adolphus of Sweden takes possession of Prague, capital of [[Bohemia]].
* [[November 21]] &ndash; In [[Venice]], a special mass celebrates the end of the [[1629–1631 Italian plague|two years of bubonic plague]] that had killed thousands of people. 
* [[November 29]] &ndash; The Treaty of Höchst is signed between King Gustavus Adolphus of Sweden and George II of Hesse-Darmstadt, with Darmstadt giving up the fortress of Rüsselsheim in return for Sweden's recognition of Darmstadt's neutrality.
* [[December 16]] &ndash; A [[volcanic eruption]] of [[Mount Vesuvius]] at [[Pompeii]] occurs, for the first time in several centuries.<ref>{{cite web |title=Vesuvius {{!}} Facts, Location, & Eruptions |url=https://www.britannica.com/place/Vesuvius |website=Encyclopædia Britannica |access-date=April 7, 2019 |language=en}}</ref>
* [[December 23]] &ndash; [[Thirty Years' War]]: [[Gustavus Adolphus of Sweden|Gustavus II Adolphus]] of Sweden takes the city of [[Mainz]], without any resistance.