March 8 » Johannes Kepler discovers the third law of planetary motion.
May 15 » Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made).
May 23 » The Second Defenestration of Prague precipitates the Thirty Years' War.
July 31 » Maurice, Prince of Orange disbands the waardgelders militia in Utrecht, a pivotal event in the Remonstrant/Counter-Remonstrant tensions.
September 18 » The twelfth baktun in the Mesoamerican Long Count calendar begins.
October 29 » English adventurer, writer, and courtier Sir Walter Raleigh is beheaded for allegedly conspiring against James I of England.
When copying data from this family tree, please include a reference to the origin: Art Frederick, "Frederick Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/frederick-family-tree/P781.php : accessed May 11, 2025), "William Richards (1618-1682)".
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