Siege of Gardiki-Arcadia
1460 CE.
Shown on the map at 37.263°, 22.058°.
The Siege of Gardiki-Arcadia was the fall of a fortress besieged by the Ottoman army under the command of Mehmed II in the Peloponnese in 1460. The castle surrendered after a one-day siege. It was the largest and most formidable castle in the region.
Text from the Wikipedia article Siege of Gardiki-Arcadia, licensed CC BY-SA 4.0.