Dolbadarn Castle rests on a rocky hillock at the tip of Llyn Padarn, perched above a roadway near Llanberis, in Gwynedd, north Wales. It was built by the Princes of Gwynedd some time before 1230 and was active through at least 1284 and into the early 15th century [1]. In the 19th century, it was immortalised in the eponymous romantic painting by J. M. W. Turner.