February 16 » Iceland's first football club, Knattspyrnufélag Reykjavíkur, is founded.
March 30 » German Society of Chemistry issues an invitation to other national scientific organizations to appoint delegates to the International Committee on Atomic Weights.
July 17 » NEC Corporation is organized as the first Japanese joint venture with foreign capital.
July 29 » The First Hague Convention is signed.
October 11 » The Second Boer War erupts in South Africa between the British-ruled Cape Colony, and the Boer-ruled Transvaal and Orange Free State.
Day of death May 31, 1981
The temperature on May 31, 1981 was between 14.2 °C and 26.6 °C and averaged 19.3 °C. There was 6.4 mm of rain during 3.2 hours. There was 8.4 hours of sunshine (51%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
April 4 » Iran–Iraq War: The Islamic Republic of Iran Air Force mounts an attack on H-3 Airbase and destroys about 50 Iraqi aircraft.
April 25 » More than 100 workers are exposed to radiation during repairs of at the Tsuruga Nuclear Power Plant in Japan.
May 21 » Transamerica Corporation agrees to sell United Artists to Metro-Goldwyn-Mayer for $380million after the box office failure of the 1980 film Heaven's Gate.
September 15 » The John Bull becomes the oldest operable steam locomotive in the world when the Smithsonian Institution operates it under its own power outside Washington, D.C.
December 4 » South Africa grants independence to the Ciskei "homeland" (not recognized by any government outside South Africa).
December 31 » A coup d'état in Ghana removes President Hilla Limann's PNP government and replaces it with the Provisional National Defence Council led by Flight lieutenant Jerry Rawlings.
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/I78253.php : accessed February 10, 2026), "Siebrigje Wagenaar (1899-1981)".
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