January 31 » Czechoslav Trade Union Association is founded in Prague.
April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
December 6 » London becomes the world's first city to host licensed taxicabs.
Day of marriage August 6, 1921
The temperature on August 6, 1921 was between 15.7 °C and 21.7 °C and averaged 17.7 °C. There was 2.2 mm of rain. There was 5.6 hours of sunshine (37%). The average windspeed was 4 Bft (moderate breeze) 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.
April 2 » The Autonomous Government of Khorasan, a military government encompassing the modern state of Iran, is established.
May 3 » The Government of Ireland Act 1920 is passed, dividing Ireland into Northern Ireland and Southern Ireland.
July 22 » Rif War: The Spanish Army suffers its worst military defeat in modern times to the Berbers of the Rif region of Spanish Morocco.
September 7 » In Atlantic City, New Jersey, the first Miss America Pageant, a two-day event, is held.
October 26 » The Chicago Theatre opens.
November 4 » Japanese Prime Minister Hara Takashi is assassinated in Tokyo.
Day of death May 15, 1970
The temperature on May 15, 1970 was between 8.2 °C and 19.9 °C and averaged 13.3 °C. There was 0.8 mm of rain during 1.5 hours. There was 1.3 hours of sunshine (8%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the east-northeast. Source: KNMI
When copying data from this family tree, please include a reference to the origin: Peeters Mathieu, "FutureHistory", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-riske/I6111.php : accessed February 8, 2026), "Theophiel "Theophile" (Theophiel "Theophile") de Groep (1897-1970)".
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