Dykes must have been important features within the early medieval landscape, but scarcely attract more than cursory discussion in archaeological literature focused on Wales and western Britain. Analysis of a dyke recorded in a boundary clause attached to an eighth century charter in the Book of Llandaff demonstrates how a multidisciplinary approach can garner new insights into the function and significance of dykes in the early medieval landscape. Llywarch Hen’s Dyke defined a large part of the bounds of Llan-gors, a royal estate in the kingdom of Brycheiniog. On the ground the dyke is represent by a prominent agricultural land boundary, but the monument also operated as a ‘mnemonic peg’ through which oral traditions associated with power and place were narrated
