The remains of Aberystwyth castle...I've included the description below as contrast for what we see now.
"Building work started in 1277 at the time of the First Welsh War. It was begun during Edward I's first Welsh campaign at the same time as work started at Flint, Rhuddlan and Builth Wells. The inner ward was built in a diamond-shaped concentric castle, with a twin D-shaped gatehouse keep and mural towers at each corner. The outer ward is described as consisting of a "twin D-shaped gatehouse, a barbican, a rock-cut ditch and a large curtain wall with towers"." https://sealion.club/attachment/2092616