In a fascinating study, the reader is presented with a detailed description and analysis of Offa's Dyke, set against the background of the political and social context of the kingdom of Mercia, over which King Offa ruled from 757 to 796. This new interpretation of the Dyke's line, length and purpose is offered in the light of extensive research by the authors who have over 50 years' experience between them. It will appeal to all, including academics, amateur historians and archaeologists, as well as those visiting the area, including walkers of the Dyke itself.