February 4 » George Washington is unanimously elected as the first President of the United States by the U.S. Electoral College.
April 20 » George Washington arrives at Grays Ferry, Philadelphia while en route to Manhattan for his inauguration.
July 12 » In response to the dismissal of the French finance minister Jacques Necker, the radical journalist Camille Desmoulins gives a speech which results in the storming of the Bastille two days later.
July 14 » Alexander Mackenzie finally completes his journey to the mouth of the great river he hoped would take him to the Pacific, but which turns out to flow into the Arctic Ocean. Later named after him, the Mackenzie is the second-longest river system in North America.
August 4 » France: Members of the National Constituent Assembly take an oath to end feudalism and abandon their privileges.
August 28 » William Herschel discovers a new moon of Saturn: Enceladus.
Day of death January 1, 1791
The temperature on January 1, 1791 was about 1.0 °C. Wind direction mainly south east. Weather type: betrokken mist. 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.
September 9 » Washington, D.C., the capital of the United States, is named after President George Washington.
September 14 » The Papal States lose Avignon to Revolutionary France.
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: Nathalie Persoon, "Family tree Persoon", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-persoon/I49.php : accessed January 6, 2026), "Pieter Martijn van Hattem (1789-1791)".
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