March 10 » French Huguenot Jean Calas, who had been wrongly convicted of killing his son, dies after being tortured by authorities; the event inspired Voltaire to begin a campaign for religious tolerance and legal reform.
May 22 » Sweden and Prussia sign the Treaty of Hamburg.
May 22 » Trevi Fountain is officially completed and inaugurated in Rome.
June 24 » Battle of Wilhelmsthal: The British-Hanoverian army of Ferdinand of Brunswick defeats French forces in Westphalia.
July 17 » Former emperor Peter III of Russia is murdered.
September 12 » The Sultanate of Sulu ceded Balambangan Island to the British East India Company
Day of death September 8, 1791
The temperature on September 8, 1791 was about 18.0 °C. Wind direction mainly east by north. Weather type: omtrent helder. Source: KNMI
February 18 » Congress passes a law admitting the state of Vermont to the Union, effective 4 March, after that state had existed for 14 years as a de facto independent largely unrecognized state.
July 17 » Members of the French National Guard under the command of General Lafayette open fire on a crowd of radical Jacobins at the Champ de Mars, Paris, during the French Revolution, killing scores of people.
August 21 » A Vodou ceremony, led by Dutty Boukman, turns into a violent slave rebellion, beginning the Haitian Revolution.
August 30 » HMSPandora sinks after having run aground on the outer Great Barrier Reef the previous day.
September 30 » France's National Constituent Assembly is dissolved, to be replaced the next day by the National Legislative Assembly
September 30 » The first performance of Mozart's opera The Magic Flute takes place two months before his death.
When copying data from this family tree, please include a reference to the origin: F. Kueter, "Family tree Kueter", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_kueter/I67349.php : accessed February 19, 2026), "Immetje Jans DEKKER (????-1791)".
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