Hidden Earthworks: Excavation and Protection of Offa’s and Wat’s Dykes

Paul Belford


Concerns over the condition of linear earthworks in north-east Wales have resulted in a series of projects undertaken by the Clwyd-Powys Archaeological Trust (CPAT). These have taken place on both Offa’s Dyke and Wat’s Dyke, and on parts of those monuments that are both legally protected (scheduled) and those which have no such protection. This article reports on two such projects, jointly funded by Cadw and the National Trust, which looked at Offa’s and Wat’s Dykes in 2018 and 2019. Excavations took place on unscheduled sections of both monuments where little above-ground evidence survived; in both cases the work revealed well-preserved sections of ditch and bank. Samples were recovered for palaeoenvironmental analysis and dating. The implications of these results for research and protection of the monuments in the future are discussed.


Dykes, Chirk, Erddig, excavation, scheduling

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Belford, P. 2017. Offa’s Dyke: a line in the landscape, in T. Jenkins and R. Abbiss (eds) Fortress Salopia. Solihull: Helion: 60–81.

Belford, P. 2018. Politics and heritage: developments in historic environment policy and practice in Wales. The Historic Environment: Policy and Practice 9(2): 1–25.

Cadw 2011. Conservation Principles for the Sustainable Management of the Historic Environment in Wales. Cardiff: Cadw.

Cadw/ICOMOS 1995. Register of Landscapes, Parks and Gardens of Special Historic Interest in Wales. Part 1. Parks and Gardens: Clwyd. Cardiff: Cadw.

Clark, K. 2001. Informed Conservation: Understanding Historic Buildings and their Landscapes for Conservation. London: English Heritage.

English Heritage 2008. Conservation Principles, Policies and Guidance. London: English Heritage.

Fox, C. 1955. Offa’s Dyke. London: British Academy.

Gallagher, C. 1996. Chirk Castle: a Survey of the Landscape. London: National Trust.

Grant, I. and Jones, N.W. 2019a. Wat’s Dyke, Erddig, Wrexham: Community Excavation. Unpublished report. CPAT Report No. 1600.

Grant, I. 2014. Offa’s Dyke DE138, Chirk, Wrexham: Survey, Excavation and recording. Unpublished report. CPAT Report No. 1224.

Grant, I. and Jones, N.W. 2019b. Chirk Castle, Wrexham: Community Excavation 2018. Unpublished report. CPAT Report No. 1631.

Haygarth Berry Associates 2018. Offa’s Dyke Conservation Management Plan. Draft 30 November 2018. Offa’s Dyke Association.

Hill, D. and Worthington, M. 2003. Offa’s Dyke. Stroud: Tempus.

Jones, N.W. 2017. Offa’s and Wat’s Dykes in Wrexham: Monument Condition Survey. Unpublished report. CPAT Report No. 1488.

Malim, T. and Hayes, L. 2008. The date and nature of Wat’s Dyke: a reassessment in the light of recent investigations at Gobowen, Shropshire, in S. Crawford and H. Hamerow (eds) Anglo-Saxon Studies in Archaeology and History 15. Oxford: Oxbow: 147–79.

Oliver, G. 2006. Erddig. National Trust Guidebook. Stroud: Tempus.

Ray, K. and Bapty, I. 2016. Offa’s Dyke. Landscape and Hegemony in Eighth-Century Britain. Oxford: Oxbow.

DOI: http://dx.doi.org/10.23914/odj.v1i0.251


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Edited in Madrid by JAS Arqueología