Siege of Barcelona
800 CE.
Shown on the map at 41.402°, 2.167°.
The siege of Barcelona was a military operation by a Carolingian army with the aim of conquering the city of Barcelona, which had been under Muslim control for 80 years. The siege and conquest were part of the expansion of the Marca Hispanica and the constitution of the County of Barcelona by the Carolingians.
Text from the Wikipedia article Siege of Barcelona (801), licensed CC BY-SA 4.0.