Siege of Poitiers
1569 CE.
Shown on the map at 46.581°, 0.335°.
The siege of Poitiers was a siege of the French city of Poitiers in summer 1569 as part of the French Wars of Religion. By that time, the city was a Catholic stronghold faithful to Charles IX of France, though Jean Calvin had preached there in 1534 and it had taken the Protestant side from May to July 1563 before being recaptured by the Catholic Royalist party.
Text from the Wikipedia article Siege of Poitiers (1569), licensed CC BY-SA 4.0.