1187
Conquest of Jerusalem
Siege · Middle East
On this day
362 events in the atlas are dated to 20 September, from 1066 to 2026. The best known come first; below them is every one, age by age, the most significant first.
1187
Siege · Middle East
1792
Battle · Europe
1835
War · South America · 1835 – 1845
1959
Event
2008
Attack · South Asia
2017
Treaty · North 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.