Dyma lyfr sy'n gosod un o gestyll mwyaf pwysig ond lleiaf adnabyddus Cymru yn ol ym myw hanes Cymru'r Oesoedd Canol.
Neil Ludlow is a consultant archaeologist. Formerly a Project Manager with Dyfed Archaeological Trust, he practised in west Wales for twenty-five years acquiring a comprehensive knowledge of its medieval history and buildings.