Navarino massacre
1821 CE.
Shown on the map at 36.912°, 21.691°.
The siege of Navarino was one of the earliest battles of the Greek War of Independence. It resulted in one of a series of massacres which resulted in the extermination of the Turkish civilian population of the region.
Text from the Wikipedia article Navarino massacre, licensed CC BY-SA 4.0.