May 7 » The city of New Orleans is founded by Jean-Baptiste Le Moyne, Sieur de Bienville.
May 15 » James Puckle, a London lawyer, patents the world's first machine gun.
June 26 » Alexei Petrovich, Tsarevich of Russia, Peter the Great's son, mysteriously dies after being sentenced to death by his father for plotting against him.
July 21 » The Treaty of Passarowitz between the Ottoman Empire, Austria and the Republic of Venice is signed.
November 30 » King Charles XII of Sweden dies during a siege of the fortress of Fredriksten in Norway.
December 17 » War of the Quadruple Alliance: Great Britain declares war on Spain.
Day of death October 23, 1780
The temperature on October 23, 1780 was about 12.0 °C. Wind direction mainly west. Weather type: zeer betrokken. Source: KNMI
March 14 » American Revolutionary War: Spanish forces capture Fort Charlotte in Mobile, Alabama, the last British frontier post capable of threatening New Orleans.
April 16 » Franz Friedrich Wilhelm von Fürstenberg founds the University of Münster.
May 13 » The Cumberland Compact is signed by leaders of the settlers in the Cumberland River area of what would become the U.S. state of Tennessee, providing for democratic government and a formal system of justice.
October 10 » The Great Hurricane of 1780 kills 20,000–30,000 in the Caribbean.
November 4 » The Rebellion of Túpac Amaru II against Spanish rule in the Viceroyalty of Peru begins.
December 14 » Founding Father Alexander Hamilton marries Elizabeth Schuyler Hamilton at the Schuyler Mansion in Albany, New York
When copying data from this family tree, please include a reference to the origin: Keith Mann Spencer, "Mann Spencer Tree", database, Genealogy Online (https://www.genealogieonline.nl/mann-spencer-tree/P1133.php : accessed January 31, 2026), "Joanna Cady (1718-1780)".
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