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 5 » Russia and Prussia sign the Treaty of St. Petersburg.
May 22 » Sweden and Prussia sign the Treaty of Hamburg.
June 24 » Battle of Wilhelmsthal: The British-Hanoverian army of Ferdinand of Brunswick defeats French forces in Westphalia.
July 9 » Catherine the Great becomes Empress of Russia following the coup against her husband, Peter III.
July 17 » Former emperor Peter III of Russia is murdered.
Day of marriage August 5, 1786
The temperature on August 5, 1786 was about 15.0 °C. Wind direction mainly west-southwest. Weather type: zeer betrokken. Source: KNMI
May 1 » In Vienna, Austria, Mozart's opera The Marriage of Figaro is performed for the first time.
August 8 » Mont Blanc on the French-Italian border is climbed for the first time by Jacques Balmat and Dr. Michel-Gabriel Paccard.
August 11 » Captain Francis Light establishes the British colony of Penang in Malaysia.
November 7 » The oldest musical organization in the United States is founded as the Stoughton Musical Society.
November 30 » The Grand Duchy of Tuscany, under Pietro Leopoldo I, becomes the first modern state to abolish the death penalty (later commemorated as Cities for Life Day).
December 4 » Mission Santa Barbara is dedicated (on the feast day of Saint Barbara).
When copying data from this family tree, please include a reference to the origin: R.A.Hemerik, "Descendants Hemerik-Broekhuizen-Huner-Koper-Barink", database, Genealogy Online (https://www.genealogieonline.nl/parenteel-hemerik/I108677.php : accessed February 13, 2026), "Johanna Margaretha Koster (1762-????)".
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