March 2 » The Battle of Adwa: The Italian Army defeated by the Ethiopian Army in Adwa, Tigray, Ethiopia.
April 6 » In Athens, the opening of the first modern Olympic Games is celebrated, 1,500 years after the original games are banned by Roman emperor Theodosius I.
April 15 » Closing ceremony of the Games of the I Olympiad in Athens, Greece.
May 18 » The United States Supreme Court rules in Plessy v. Ferguson that the "separate but equal" doctrine is constitutional.
May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
June 2 » Guglielmo Marconi applies for a patent for his wireless telegraph.
Day of marriage November 20, 1920
The temperature on November 20, 1920 was between -1.4 °C and 5.8 °C and averaged 1.4 °C. There was 7.5 hours of sunshine (87%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south east. 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.
January 23 » The Netherlands refuses to surrender the exiled Kaiser Wilhelm II of Germany to the Allies.
February 24 » Nancy Astor becomes the first woman to speak in the House of Commons of the United Kingdom following her election as a Member of Parliament (MP) three months earlier.
March 8 » The Arab Kingdom of Syria, the first modern Arab state to come into existence, is established.
June 11 » During the U.S. Republican National Convention in Chicago, U.S. Republican Party leaders gathered in a room at the Blackstone Hotel to come to a consensus on their candidate for the U.S. presidential election, leading the Associated Press to coin the political phrase "smoke-filled room".
August 15 » Polish–Soviet War: Battle of Warsaw, so-called Miracle at the Vistula.
October 14 » Finland and Soviet Russia sign the Treaty of Tartu, exchanging some territories.
Day of death June 26, 1968
The temperature on June 26, 1968 was between 13.2 °C and 19.1 °C and averaged 15.9 °C. There was 1.2 mm of rain during 2.5 hours. There was 10.0 hours of sunshine (60%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 5 » Alexander Dubček comes to power in Czechoslovakia, effectively beginning the "Prague Spring".
April 6 » In Richmond, Indiana's downtown district, a double explosion kills 41 and injures 150.
June 5 » Presidential candidate Robert F. Kennedy is assassinated by Sirhan Sirhan.
August 21 » Cold War: Nicolae Ceaușescu, leader of Communist Romania, publicly condemns the Soviet-led Warsaw Pact invasion of Czechoslovakia, encouraging the Romanian population to arm itself against possible Soviet reprisals.
September 13 » Cold War: Albania leaves the Warsaw Pact.
October 14 » The first live TV broadcast by American astronauts in orbit is performed by the Apollo 7 crew.
When copying data from this family tree, please include a reference to the origin: Jan Kaper, "Family tree Kaper", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kaper/I55682.php : accessed February 11, 2026), "Jan Hendrik Koorn (1896-1968)".
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