1223
Battle of the Kalka River
Battle · Europe
On this day
339 events in the atlas are dated to 31 May, from 436 BCE to 2026. The best known come first; below them is every one, age by age, the most significant first.
1223
Battle · Europe
1793
Rebellion
1864
Siege · North America
1921
Attack · North America
1970
Natural disaster · South America
2010
Natural disaster · Middle East
Each event is listed under the date its sources give, as its page shows it. Before 1582, and in some countries later (Britain until 1752, Russia until 1918), that is a date of the Julian calendar, as on Wikipedia’s pages for each day.