While the Edwardian castles of Conwy, Beaumaris, Harlech, and Caernarfon are rightly hailed as outstanding examples of castle architecture, the castles of the native Welsh princes are far more enigmatic. Where some dominate their surroundings as completely as any castle of Edward I, others are concealed in the depths of forests, or tucked away in the corners of valleys, their relationship with the landscape of which they are a part far more difficult...