The medieval castles of Wales are an imposing group of monuments. Although there are examples from the Norman period, the vast majority of the surviving castles date from the thirteenth century, a dramatic and turbulent period when Wales was nearly united under native rule before succumbing to Edward I's conquest: Caernarfon, Conway, Harlech and Beaumaris are justly famous, but equally fine examples can be found elsewhere, including Pembroke, Kidwelly...