March 1 » The Unitas Fratrum is established in the village of Kunvald, on the Bohemian-Moravian borderland. It is to date the second oldest Protestant denomination.
August 14 » Publication of the Mainz Psalter, the first book to feature a printed date of publication and printed colophon
When copying data from this family tree, please include a reference to the origin: Jaap van der Werff, "Family tree Van der Werff / Kooistra", database, Genealogy Online (https://www.genealogieonline.nl/van-der-werff-stamboom/I500734.php : accessed September 25, 2024), "Hadewigh Taets van Amerongen (????-1457)".
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