Aberystwyth Castle built
1277 CE.
Shown on the map at 52.413°, -4.090°.
Aberystwyth Castle (Welsh: Castell Aberystwyth) is a Grade I listed Edwardian fortress located in Aberystwyth, Ceredigion, Mid Wales. It was built in response to the First Welsh War in the late 13th century, replacing an earlier fortress located a mile to the south. During a national uprising by Owain Glyndŵr, the Welsh captured the castle in 1404, but it was recaptured by the English four years later. From 1637 it housed a Royal mint of Charles I, which minted coins from locally mined silver. The castle was slighted by Oliver Cromwell in 1649.
Text from the Wikipedia article Aberystwyth Castle, licensed CC BY-SA 4.0.