May 7 » In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.
June 11 » Paris–Bordeaux–Paris, sometimes called the first automobile race in history or the "first motor race", takes place.
June 28 » The United States Court of Private Land Claims rules James Reavis’s claim to Barony of Arizona is "wholly fictitious and fraudulent."
August 31 » German Count Ferdinand von Zeppelin patents his navigable balloon.
October 8 » Korean Empress Myeongseong is assassinated by Japanese infiltrators.
November 28 » The first American automobile race takes place over the 54 miles from Chicago's Jackson Park to Evanston, Illinois. Frank Duryea wins in approximately 10 hours.
Day of marriage April 21, 1917
The temperature on April 21, 1917 was between 3.4 °C and 9.8 °C and averaged 5.8 °C. There was 3.5 hours of sunshine (25%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the north-northwest. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 11 » The Kingsland munitions factory explosion occurs as a result of sabotage.
March 8 » The United States Senate votes to limit filibusters by adopting the cloture rule.
June 13 » World War I: The deadliest German air raid on London of the war is carried out by Gotha G.IV bombers and results in 162 deaths, including 46 children, and 432 injuries.
August 6 » World War I: Battle of Mărășești between the Romanian and German armies begins.
November 5 » Tikhon is elected the Patriarch of Moscow and of the Russian Orthodox Church.
November 26 » The National Hockey League is formed, with the Montreal Canadiens, Montreal Wanderers, Ottawa Senators, Quebec Bulldogs, and Toronto Arenas as its first teams.
When copying data from this family tree, please include a reference to the origin: Enno Borgsteede, "Borgsteede family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-borgsteede/I9103.php : accessed February 7, 2026), "Lady Mary Alice Gasgoyne-Cecil (1895-1988)".
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