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).
May 15 » French Revolution: Maximilien Robespierre proposes the Self-denying Ordinance.
July 14 » The Priestley Riots drive Joseph Priestley, a supporter of the French Revolution, out of Birmingham, England.
September 9 » Washington, D.C., the capital of the United States, is named after President George Washington.
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.
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
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 14 » The Priestley Riots drive Joseph Priestley, a supporter of the French Revolution, out of Birmingham, England.
August 26 » John Fitch is granted a United States patent for the steamboat.
September 5 » Olympe de Gouges writes the Declaration of the Rights of Woman and of the Female Citizen.
September 9 » Washington, D.C., the capital of the United States, is named after President George Washington.
November 9 » Foundation of the Dublin Society of United Irishmen.
When copying data from this family tree, please include a reference to the origin: Irene Jolanda van der Meulen, "Family tree Ype Ypes (waaronder van der Meulen)", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ype-ypes/I4437.php : accessed January 29, 2026), "Jeltje Gjalts Adema (1791-????)".
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