917 CE
Battle of Achelous
Battle · Europe
On this day
384 events in the atlas are dated to 20 August, from 914 CE to 2026. The best known come first; below them is every one, age by age, the most significant first.
917 CE
Battle · Europe
1794
Battle · North America
1860
Exploration · 1860 – 1861
1927
Event · Europe · 1927 – 2001
2020
Natural disaster
2023
Election · South America
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.