Battle of the Gulf of Naples
1284 CE.
Shown on the map at 40.700°, 14.483°.
The Battle of the Gulf of Naples was a naval engagement during the War of the Sicilian Vespers. Fought on 5 June 1284 in the south of the Gulf of Naples, the battle saw an Aragonese–Sicilian fleet commanded by Roger of Lauria defeat a Angevin fleet commanded by Prince Charles of Salerno. Charles was captured during the battle, and the Aragonese victory helped secure Aragonese control of the sea around Sicily.
Text from the Wikipedia article Battle of the Gulf of Naples, licensed CC BY-SA 4.0.