Conquest of Santarém
1147 CE.
Shown on the map at 39.237°, -8.685°.
The conquest of Santarém took place on 15 March 1147, when the troops of the Kingdom of Portugal under the leadership of Afonso I of Portugal captured the Almoravid city of Santarém (at the time called Shantarin).
Text from the Wikipedia article Conquest of Santarém, licensed CC BY-SA 4.0.