February 27 » The British Labour Party is founded.
March 7 » The German liner SSKaiser Wilhelm der Grosse becomes the first ship to send wireless signals to shore.
May 18 » The United Kingdom proclaims a protectorate over Tonga.
June 20 » Boxer Rebellion: The Imperial Chinese Army begins a 55-day siege of the Legation Quarter in Beijing, China.
July 2 » Jean Sibelius' Finlandia receives its première performance in Helsinki with the Helsinki Philharmonic Society conducted by Robert Kajanus.
July 29 » In Italy, King Umberto I of Italy is assassinated by the anarchist Gaetano Bresci.
Day of marriage May 19, 1921
The temperature on May 19, 1921 was between 7.7 °C and 18.8 °C and averaged 12.9 °C. There was 0.2 mm of rain. There was 9.0 hours of sunshine (57%). The average windspeed was 2 Bft (weak wind) 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.
February 12 » Bolsheviks launch a revolt in Georgia as a preliminary to the Red Army invasion of Georgia.
February 15 » Kingdom of Romania establishes its legation in Helsinki.
March 20 » The Upper Silesia plebiscite was a plebiscite mandated by the Versailles Treaty to determine a section of the border between Weimar Germany and Poland.
July 23 » The Communist Party of China (CPC) is established at the founding National Congress.
October 13 » Soviet republics sign the Treaty of Kars to formalize the borders between Turkey and the South Caucasus states.
December 6 » The Anglo-Irish Treaty is signed in London by British and Irish representatives.
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/I178096.php : accessed October 22, 2026), "Johannes Jan de Jong (1900-)".
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