March 14 » Admiral Sir John Byng is executed by firing squad aboard HMSMonarch for breach of the Articles of War.
May 6 » English poet Christopher Smart is admitted into St Luke's Hospital for Lunatics in London, beginning his six-year confinement to mental asylums.
June 23 » Battle of Plassey: Three thousand British troops under Robert Clive defeat a 50,000-strong Indian army under Siraj ud-Daulah at Plassey.
November 5 » Seven Years' War: Frederick the Great defeats the allied armies of France and the Holy Roman Empire at the Battle of Rossbach.
December 5 » Seven Years' War: Battle of Leuthen: Frederick II of Prussia leads Prussian forces to a decisive victory over Austrian forces under Prince Charles Alexander of Lorraine.
December 31 » Empress Elizabeth I of Russia issues her ukase incorporating Königsberg into Russia.
Day of burial July 21, 1787
The temperature on July 21, 1787 was about 15.0 °C. Wind direction mainly southwest. Weather type: betrokken. Source: KNMI
January 11 » William Herschel discovers Titania and Oberon, two moons of Uranus.
May 25 » After a delay of 11 days, the United States Constitutional Convention formally convenes in Philadelphia after a quorum of seven states is secured.
July 13 » The Continental Congress enacts the Northwest Ordinance establishing governing rules for the Northwest Territory. It also establishes procedures for the admission of new states and limits the expansion of slavery.
September 17 » The United States Constitution is signed in Philadelphia.
October 29 » Mozart's opera Don Giovanni receives its first performance in Prague.
December 7 » Delaware becomes the first state to ratify the United States Constitution.
When copying data from this family tree, please include a reference to the origin: Theo van den Bogaard, "Family tree Janssen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-janssen/I1237.php : accessed January 10, 2026), "Maria Joannes Janssens Wauters (1726-1787)".
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