Battle of Moel-y-don
1282 CE.
Shown on the map at 53.230°, -4.154°.
The Battle of Moel-y-don was fought in 1282 as part of the conquest of Wales by Edward I. Also known as the Battle of the Bridge of Boats, it is unlikely the battle site was near Moel-y-don, but farther north.
Text from the Wikipedia article Battle of Moel-y-don, licensed CC BY-SA 4.0.