February 9 » The Davis Cup competition is established.
February 27 » Fußball-Club Bayern München is founded.
March 13 » British forces occupy Bloemfontein, Orange Free State, during the Second Boer War.
May 18 » The United Kingdom proclaims a protectorate over Tonga.
July 9 » The Governor of Shanxi province in North China orders the execution of 45 foreign Christian missionaries and local church members, including children.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death April 4, 1903
The temperature on April 4, 1903 was between 4.0 °C and 10.9 °C and averaged 8.0 °C. Source: KNMI
January 17 » El Yunque National Forest in Puerto Rico becomes part of the United States National Forest System as the Luquillo Forest Reserve.
April 19 » The Kishinev pogrom in Kishinev (Bessarabia) begins, forcing tens of thousands of Jews to later seek refuge in Palestine and the Western world.
May 29 » In the May Coup, Alexander I, King of Serbia, and Queen Draga, are assassinated in Belgrade by the Black Hand (Crna Ruka) organization.
August 29 » The Slava, the last of the five Borodino-class battleships, is launched.
October 10 » The Women's Social and Political Union is founded in support of the enfranchisement of British women.
December 14 » The Wright brothers make their first attempt to fly with the Wright Flyer at Kitty Hawk, North Carolina.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I113353.php : accessed October 19, 2026), "Folkert Helder (1900-1903)".
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