July 1 » Union of Lublin: The Kingdom of Poland and the Grand Duchy of Lithuania confirm a real union; the united country is called the Polish–Lithuanian Commonwealth or the Republic of Both Nations.
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/I552495.php : accessed February 15, 2026), "Pierre Lejeune".
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