May 17 » Louis Jolliet and Jacques Marquette begin exploring the Mississippi River.
June 17 » French explorers Jacques Marquette and Louis Jolliet reach the Mississippi River and become the first Europeans to make a detailed account of its course.
November 11 » Second Battle of Khotyn in Ukraine: Polish–Lithuanian Commonwealth forces under the command of Jan Sobieski defeat the Ottoman army. In this battle, rockets made by Kazimierz Siemienowicz are successfully used.
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I82076.php : accessed January 4, 2026), "Leonardus "Jan" van de Laer (± 1645-????)".
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