Battle of Licosa
846 CE.
Shown on the map at 40.150°, 14.540°.
The naval battle of Licosa, fought in the year 846 near the homonymous promontory, in which the combined fleet of the Byzantine duchies of Naples, Amalfi, Gaeta and Sorrento, inspired by the Duke Sergius I of Naples and led by his son Caesar, defeated the Saracen fleet.
Text from the Wikipedia article Battle of Licosa (846), licensed CC BY-SA 4.0.