January 23 » The Malolos Constitution is inaugurated, establishing the First Philippine Republic. Emilio Aguinaldo is sworn in as its first President.
February 6 » Spanish–American War: The Treaty of Paris, a peace treaty between the United States and Spain, is ratified by the United States Senate.
February 16 » Iceland's first football club, Knattspyrnufélag Reykjavíkur, is founded.
March 6 » Bayer registers "Aspirin" as a trademark.
March 31 » Malolos, capital of the First Philippine Republic, is captured by American forces.
September 13 » Mackinder, Ollier and Brocherel make the first ascent of Batian (5,199 m - 17,058ft), the highest peak of Mount Kenya.
Day of marriage January 15, 1920
The temperature on January 15, 1920 was between 0.7 °C and 6.3 °C and averaged 3.6 °C. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the 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 8 » The Arab Kingdom of Syria, the first modern Arab state to come into existence, is established.
July 12 » The Soviet–Lithuanian Peace Treaty is signed, by which Soviet Russia recognizes the independence of Lithuania.
November 12 » Italy and the Kingdom of Serbs, Croats and Slovenes sign the Treaty of Rapallo.
November 15 » The Free City of Danzig is established.
November 28 » FIDAC (The Interallied Federation of War Veterans Organisations), the first international organization of war veterans is established in Paris, France
December 19 » King Constantine I is restored as King of the Hellenes after the death of his son Alexander of Greece and a plebiscite.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I77066.php : accessed October 5, 2026), "Sytske Oldenburger (1899-????)".
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