Siege of Ma'arra
1098 CE.
Shown on the map at 35.643°, 36.668°.
The siege of Ma'arra occurred in late 1098 in the city of Ma'arrat Nu'man, in what is modern-day Syria, during the First Crusade. It is infamous for cannibalism committed by the Crusaders, possibly on a widespread scale.
Text from the Wikipedia article Siege of Ma'arra, licensed CC BY-SA 4.0.