April 15 » Closing ceremony of the Games of the I Olympiad in Athens, Greece.
May 18 » Khodynka Tragedy: A mass panic on Khodynka Field in Moscow during the festivities of the coronation of Russian Tsar Nicholas II results in the deaths of 1,389 people.
June 15 » The deadliest tsunami in Japan's history kills more than 22,000 people.
August 27 » Anglo-Zanzibar War: The shortest war in world history (09:02 to 09:40), between the United Kingdom and Zanzibar.
November 17 » The Western Pennsylvania Hockey League, which later became the first ice hockey league to openly trade and hire players, began play at Pittsburgh's Schenley Park Casino.
December 30 » Filipino patriot and reform advocate José Rizal is executed by a Spanish firing squad in Manila.
Day of marriage January 4, 1921
The temperature on January 4, 1921 was between 6.0 °C and 9.2 °C and averaged 8.0 °C. There was 2.0 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-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.
February 15 » Kingdom of Romania establishes its legation in Helsinki.
February 25 » Georgian capital Tbilisi falls to the invading Russian forces after heavy fighting and the Russians declare the Georgian Soviet Socialist Republic.
March 17 » The Second Polish Republic adopts the March Constitution.
May 8 » The creation of the Communist Party of Romania.
May 31 » The Tulsa race massacre kills at least 39, but other estimates of black fatalities vary from 55 to about 300.
August 28 » The Red Army dissolved the Free Territory, after driving the Black Army out of Ukraine.
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/I26124.php : accessed February 21, 2026), "Peter Hubertus Hermans (1896-????)".
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