At a time when migrations and borders are again central to our politics and national identity, the archaeologist looks back in time, to the creation of what was then Europe’s largest earthwork, Offa’s Dyke. He examines the role of the Mercian kingdom as a European power, and the ways in which Alfred and the Saxon kings rewrote that history. Chaired by Jesse Norman, MP for South Herefordshire, through which Offa’s Dyke approaches Hay.