January 10 » The Siege of Dunlap's Station begins near Cincinnati during the Northwest Indian War.
March 4 » The Constitutional Act of 1791 is introduced by the British House of Commons in London which envisages the separation of Canada into Lower Canada (Quebec) and Upper Canada (Ontario).
August 26 » John Fitch is granted a United States patent for the steamboat.
September 13 » King Louis XVI of France accepts the new constitution.
September 30 » The first performance of Mozart's opera The Magic Flute takes place two months before his death.
November 9 » Foundation of the Dublin Society of United Irishmen.
Christening day September 18, 1791
The temperature on September 18, 1791 was about 11.0 °C. There was 22 mm of rainWind direction mainly northwest. Weather type: zeer betrokken. Source: KNMI
March 2 » Long-distance communication speeds up with the unveiling of a semaphore machine in Paris.
March 4 » The Constitutional Act of 1791 is introduced by the British House of Commons in London which envisages the separation of Canada into Lower Canada (Quebec) and Upper Canada (Ontario).
March 4 » Vermont is admitted to the United States as the fourteenth state.
July 14 » The Priestley Riots drive Joseph Priestley, a supporter of the French Revolution, out of Birmingham, England.
August 21 » A Vodou ceremony, led by Dutty Boukman, turns into a violent slave rebellion, beginning the Haitian Revolution.
December 15 » The United States Bill of Rights becomes law when ratified by the Virginia General Assembly.
Day of death September 15, 1868
The temperature on September 15, 1868 was about 16.2 °C. The air pressure was 3 kgf/m2 and came mainly from the north. The airpressure was 76 cm mercury. The atmospheric humidity was 67%. Source: KNMI
From June 1, 1866 till June 4, 1868 the Netherlands had a cabinet Van Zuijlen van Nijevelt - Heemskerk with the prime ministers Mr. J.P.J.A. graaf Van Zuijlen van Nijevelt (AR) and Mr. J. Heemskerk Azn. (conservatief).
From June 4, 1868 till January 4, 1871 the Netherlands had a cabinet Van Bosse - Fock with the prime ministers Mr. P.P. van Bosse (liberaal) and Mr. C. Fock (liberaal).
January 3 » Meiji Restoration in Japan: The Tokugawa shogunate is abolished; agents of Satsuma and Chōshū seize power.
May 26 » The Impeachment of Andrew Johnson ends with his acquittal by one vote.
May 29 » Mihailo Obrenović III, Prince of Serbia is assassinated.
August 13 » The 8.5–9.0 Mw Arica earthquake struck southern Peru with a maximum Mercalli intensity of XI (Extreme), causing 25,000+ deaths and a destructive basin wide tsunami that affected Hawaii and New Zealand.
August 18 » French astronomer Pierre Janssen discovers helium.
December 11 » Paraguayan War: Brazilian troops defeat Paraguayan at the Battle of Avay.
When copying data from this family tree, please include a reference to the origin: Fokke Post, "Family tree van Fokke Post", database, Genealogy Online (https://www.genealogieonline.nl/stamboom--fokke-post/I118.php : accessed February 19, 2026), "Marretje Hendriks Meun (1791-1868)".
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