Providing a dedicated venue for new research on the early medieval frontiers and borderlands of the island of Britain, the Offa's Dyke Journal (ODJ) is also the first and only open-access peer-reviewed academic journal dedicated to the investigation of frontiers and borderlands in deep-time perspective. The journal's remit spans detailed and original explorations into landscapes, earthworks, monuments and material culture. Exploring specific themes and issues in the archaeology, history and heritage of frontiers and borderlands in comparative and global perspective, ODJ is edited and produced under the auspices of the interdisciplinary research network, the Offa's Dyke Collaboratory, and funded by the University of Chester and the Offa's Dyke Association. The contents of this special issue comprise the proceedings of a conference held over Zoom on the weekend of 11-12 July 2020.