March 1 » Henri Becquerel discovers radioactive decay.
April 15 » Closing ceremony of the Games of the I Olympiad in Athens, Greece.
June 4 » Henry Ford completes the Ford Quadricycle, his first gasoline-powered automobile, and gives it a successful test run.
November 17 » The Western Pennsylvania Hockey League, which later became the first ice hockey league to openly trade and hire players, began play at Pittsburgh's Schenley Park Casino.
November 27 » Also sprach Zarathustra by Richard Strauss is first performed.
December 10 » Alfred Jarry's Ubu Roi premieres in Paris. A riot breaks out at the end of the performance.
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The Family tree Van Willigen publication was prepared by Rob van Willigen (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Rob van Willigen, "Family tree Van Willigen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-willigen/I6675.php : accessed January 19, 2026), "Dirkje Klop (1875-????)".
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