March 26 » Utrecht University is founded in the Netherlands.
April 30 » Eighty Years' War: Dutch Republic forces recapture a strategically important fort from Spain after a nine-month siege.
October 4 » Thirty Years' War: The Swedish Army defeats the armies of Saxony and the Holy Roman Empire at the Battle of Wittstock.
October 28 » The Massachusetts Bay Colony votes to establish a theological college, which would later become Harvard University.
December 13 » The Massachusetts Bay Colony organizes three militia regiments to defend the colony against the Pequot Indians. This organization is recognized today as the founding of the National Guard of the United States.
When copying data from this family tree, please include a reference to the origin: Rob van Koert, "Family tree Van Koert", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-koert/I23131.php : accessed February 26, 2026), "Jan Jansz. Plug (± 1591-> 1643)".
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