Battle of Crug Mawr
1136 CE.
Shown on the map at 52.096°, -4.621°.
The Battle of Crug Mawr (Welsh: Brwydr Crug Mawr), sometimes referred to as the Battle of Cardigan, took place in September or October 1136, as part of a struggle between the Welsh and Normans for control of Ceredigion, West Wales. The battle was fought near Penparc, northeast of Cardigan, probably on the hill now known as Banc-y-Warren; it resulted in a rout of the Norman forces, setting back their expansion in West Wales for some years.
Text from the Wikipedia article Battle of Crug Mawr, licensed CC BY-SA 4.0.