January 18 » An X-ray generating machine is exhibited for the first time by H. L. Smith.
February 1 » La bohème premieres in Turin at the Teatro Regio (Turin), conducted by the young Arturo Toscanini.
March 1 » Henri Becquerel discovers radioactive decay.
September 21 » Anglo-Egyptian conquest of Sudan: British forces under the command of Horatio Kitchener take Dongola.
November 27 » Also sprach Zarathustra by Richard Strauss is first performed.
December 14 » The Glasgow Underground Railway is opened by the Glasgow District Subway Company.
Day of marriage December 28, 1921
The temperature on December 28, 1921 was between 4.8 °C and 12.5 °C and averaged 8.5 °C. There was 7.6 mm of rain. The average windspeed was 6 Bft (strong wind) and was prevailing from the west-southwest. 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.
March 1 » Following mass protests in Petrograd demanding greater freedom in the RSFSR, the Kronstadt rebellion began, with sailors and citizens taking up arms against the Bolsheviks.
March 6 » Portuguese Communist Party is founded as the Portuguese Section of the Communist International.
March 8 » Spanish Prime Minister Eduardo Dato Iradier is assassinated while exiting the parliament building in Madrid.
March 21 » The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of war communism.
June 12 » Mikhail Tukhachevsky orders the use of chemical weapons against the Tambov Rebellion, bringing an end to the peasant uprising.
July 29 » Adolf Hitler becomes leader of the National Socialist German Workers Party.
When copying data from this family tree, please include a reference to the origin: Cees de Groot, "Family tree De Groot-Bosch", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-groot-bosch/R23.php : accessed February 25, 2026), "Pieter Maarten Roodnat (1896-????)".
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