January 8 » The papal bull Romanus Pontifex awards the Kingdom of Portugal exclusive trade and colonization rights to all of Africa south of Cape Bojador.
February 4 » In the Thirteen Years' War, the Secret Council of the Prussian Confederation sends a formal act of disobedience to the Grand Master.
March 6 » Thirteen Years' War: Delegates of the Prussian Confederation pledge allegiance to King Casimir IV of Poland who agrees to commit his forces in aiding the Confederation's struggle for independence from the Teutonic Knights.
April 9 » The Treaty of Lodi is signed, establishing a balance of power among northern Italian city-states for almost 50 years.
September 18 » Thirteen Years' War: In the Battle of Chojnice, the Polish army is defeated by the Teutonic knights.
January 16 » The first grammar of the Spanish language (Gramática de la lengua castellana) is presented to Queen Isabella I.
March 31 » Queen Isabella of Castile issues the Alhambra Decree, ordering her 150,000 Jewish and Muslim subjects to convert to Christianity or face expulsion.
April 30 » Spain gives Christopher Columbus his commission of exploration.
July 31 » The Jews are expelled from Spain when the Alhambra Decree takes effect.
November 7 » The Ensisheim meteorite, the oldest meteorite with a known date of impact, strikes the Earth around noon in a wheat field outside the village of Ensisheim, Alsace, France.
December 25 » The carrack Santa María, commanded by Christopher Columbus, runs onto a reef off Haiti due to an improper watch.
When copying data from this family tree, please include a reference to the origin: Weijerman, "Family tree Weijerman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weijerman/I6217.php : accessed February 15, 2026), "Kasimir IV von Polen (1427-1492)".
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