Deganwy is one of those castle-forts that has become part of the legend of Wales, although very little of it remains. This plan http://www.castlewales.com/deganwy1.html shows a reconstruction of the early medieval fort. It was the seat of "Maelgwyn Gwynedd, the foremost historical figure of the 6th century. <<<< as pinned. See accompanying pic.
Harlech Castle, located in Harlech, Gwynedd, Wales, is a medieval fortification, constructed atop a spur of rock close to the Irish Sea. It was built by Edward I during his invasion of Wales between 1282 and 1289 at the substantial cost of £8,190.