February 14 » British forces begin the Battle of the Tugela Heights in an effort to lift the Siege of Ladysmith.
February 27 » Fußball-Club Bayern München is founded.
July 9 » The Governor of Shanxi province in North China orders the execution of 45 foreign Christian missionaries and local church members, including children.
July 27 » Kaiser Wilhelm II makes a speech comparing Germans to Huns; for years afterwards, "Hun" would be a disparaging name for Germans.
August 3 » The Firestone Tire and Rubber Company is founded.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of marriage August 13, 1919
The temperature on August 13, 1919 was between 9.9 °C and 25.1 °C and averaged 17.6 °C. There was 10.7 hours of sunshine (72%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 15 » Great Molasses Flood: A wave of molasses released from an exploding storage tank sweeps through Boston, Massachusetts, killing 21 and injuring 150.
June 11 » Sir Barton wins the Belmont Stakes, becoming the first horse to win the U.S. Triple Crown.
June 21 » Admiral Ludwig von Reuter scuttles the German fleet at Scapa Flow, Orkney. The nine sailors killed are the last casualties of World War I.
June 28 » The Treaty of Versailles is signed, ending the state of war between Germany and the Allies of World War I.
July 23 » Prince Regent Aleksander Karađorđević signs the decree establishing the University of Ljubljana
October 17 » RCA is incorporated as the Radio Corporation of America.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I190877.php : accessed January 24, 2026), "Jacoba Maria van Os (1900-)".
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