This open-access and peer-reviewed academic publication stems from the activities of the Offa's Dyke Collaboratory, a research network founded in April 2017 to foster and support new research on the monuments and landscapes of the Anglo-Welsh borderlands and comparative studies of borderlands and frontiers from prehistory to the present. The proceedings of a series of academic and public-facing events have informed the character and direction of the Journal. Moreover, its establishment coincides with the Cadw/Historic England/Offa's Dyke Association funded Offa's Dyke Conservation Management Plan as well as other new community and research projects on linear earthworks. Published in print by Archaeopress in association with JAS Arqueologia, and supported by the University of Chester and the Offa's Dyke Association, the journal aims to provide a resource for scholars, students and the wider public regarding the archaeology, heritage and history of the Welsh Marches and its linear monuments. It also delivers a much-needed venue for interdisciplinary studies from other times and places.