March 7 » The German liner SSKaiser Wilhelm der Grosse becomes the first ship to send wireless signals to shore.
March 18 » AFC Ajax Amsterdam, The Netherlands's biggest and most successful football club, was founded.
June 18 » Empress Dowager Cixi of China orders all foreigners killed, including foreign diplomats and their families.
July 2 » Jean Sibelius' Finlandia receives its première performance in Helsinki with the Helsinki Philharmonic Society conducted by Robert Kajanus.
July 9 » The Governor of Shanxi province in North China orders the execution of 45 foreign Christian missionaries and local church members, including children.
November 7 » Second Boer War: Battle of Leliefontein, a battle during which the Royal Canadian Dragoons win three Victoria Crosses.
Day of marriage April 30, 1921
The temperature on April 30, 1921 was between 6.8 °C and 20.2 °C and averaged 13.7 °C. There was 12.0 hours of sunshine (81%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. 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 12 » Acting to restore confidence in baseball after the Black Sox Scandal, Judge Kenesaw Mountain Landis is elected as Major League Baseball's first commissioner.
January 16 » The Marxist Left in Slovakia and the Transcarpathian Ukraine holds its founding congress in Ľubochňa.
March 19 » Irish War of Independence: One of the biggest engagements of the war takes place at Crossbarry, County Cork. About 100 Irish Republican Army (IRA) volunteers escape an attempt by over 1,300 British forces to encircle them.
October 19 » The Portuguese Prime Minister and several officials are murdered in the Bloody Night coup.
October 29 » The Link River Dam, a part of the Klamath Reclamation Project, is completed.
November 4 » The Saalschutz Abteilung (hall defense detachment) of the Nazi Party is renamed the Sturmabteilung (storm detachment) after a large riot in Munich.
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/I136384.php : accessed September 26, 2026), "Harmke Laanstra (1900-)".
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