Brown, I. 2009. Beacons in the landscape. The hillforts of England and Wales. Oxford: Windgather Press.
Forde-Johnston, J. 1976. . Liverpool: Liverpool University Press.
Harding, D.W., 2012. Iron Age Hillforts in Britain and Beyond. Oxford, Oxford University Press
Historic England, 2011. Introductions to heritage assets: Hillforts. Available from
Historic England, 2011. Introductions to heritage assets: Oppida. Available from
Hogg, A.H.A. 1975. Hill-forts of Britain. London: Hart-Davis MacGibbon
Hogg, A.H.A. 1979. British Hill-Forts. An Index. Oxford: British Archaeological Reports, British Series 62
Ordnance Survey. 1962. Ordnance Survey Map of Southern Britain in the Iron Age. Chessington, Surrey: Ordnance Survey.
Raftery, B. 1994. Pagan Celtic Ireland, London: Thames & Hudson.
Ralston, I. 2006. Celtic Fortifications. Stroud: Tempus.
Waddell, J. 2000. The Prehistoric Archaeology of Ireland, 2nd Edition. Dublin: Wordwell.
If the site is a Scheduled Ancient Monument (and many hillforts are) information will be available from The National Heritage List for England:
Your local county/unitary authority Historic Environment Record (HER) will also have information on hillforts. Many of these (although not all) are searchable through Heritage Gateway, see
The National Record of the Historic Environment (NRHE, previously the National Monuments Record (NMR)) is available through Pastscape and provides individual records for hillforts:
There is also a large number of unpublished hillfort surveys in the Historic England Archive, including the original Ordnance Survey ‘antiquity models’. Information on these can be accessed from the HE Swindon centre:
The Royal Commission (subsequently English Heritage, now Historic England) has various publications, ranging from County Inventories to regional studies such as Exmoor, Dartmoor, the Malverns, and the Quantocks, which include hillforts. Also some research volumes, such as Northumberland Hillforts (), and the Wessex Hillforts Project ()
The Archaeology Data Service (ADS) holds a variety of resources including grey literature and unpublished fieldwork reports:
Cadw () holds records on protected monuments.
Cadw, the Royal Commission on the Ancient and Historical Monuments of Wales (RCAHMW), the National Museum Wales and the four Welsh Archaeological Trusts (Gwynedd, Clwyd-Powys, Dyfed and Glamorgan-Gwent) all provide information for an online resource called the ‘Historic Wales Portal’. The portal provides an overview of the records held by each organisation and can be found at:
The Royal Commission on the Ancient and Historic Monuments of Wales () curates the National Monuments Record of Wales (NMRW), where there is an index to the drawings, manuscripts and photographs held in the NMRW archive collections, see
Each of the four Welsh Archaeological Trusts holds a Historic Environment Record (HER). These are a principal online source of hillfort plans and information on sites, but tend to be variable from one area to another, see
The Trusts have also undertaken major surveys of Small Enclosures in their areas, including hillforts, and details and copies can be found on-line at each of the Trusts’ websites as follows:
The Royal Commission Inventories contain plans and information and can be found at the various Record Offices and Libraries of each of the Welsh Unitary Authorities. Ask for the ‘Inventory of Ancient Monuments of the Royal Commission’ for the county with which you are concerned, also asking for the Volume that concerns the Iron Age and hillforts. Most local authorities in Wales have an archaeological service and sometimes details of the important hillfort sites can be found on the website of the individual council concerned.
The most important journal publication pertaining to prehistoric Wales is Archaeologia Cambrensis, published by the Cambrian Archaeological Association, but the transactions of the various county and regional societies of the area of your interest can be useful. Consult your local County Library Service.
The principal sources of plans for forts in Scotland are the OS 25-inch maps and the County Inventories prepared by the Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS), now subsumed into Historic Environment Scotland.
The latter are available through many libraries and can be consulted in the reading room of Historic Environment Scotland, John Sinclair House, Bernard Terrace, Edinburgh EH8 9NX. The catalogue of original drawings held in the National Collection is available online through CANMORE at Relatively few of these drawings are yet digitised, but original ink drawings and pencil surveys dating from 1913 and after can be consulted by appointment. The original ink versions of many of the forts surveyed for the OS 1:2500 map are included in the archive set of OS index cards in the National Collection and can also be inspected on request.
The Proceedings of the Society of Antiquaries of Scotland is the main source for plans drawn up prior to the establishment of the Royal Commission in 1908 and are available online via the publications section of the Society of Antiquaries of Scotland website at .
Plans may also be available through Local Authority Sites and Monuments Records/Historic Environment Records (HERs), see:
Plans appearing on the 1st and 2nd editions of the OS 1:10560 maps are available online from the National Library of Scotland at , where they can be inspected in a seamless zoomable format covering the whole of Scotland; 1:2500 sheets are available as individual sheets. For the zoomable format, a National Grid Reference copied from Canmore can be inserted to take the user directly to the site concerned.
A listing of known hillforts in the Republic of Ireland is available in Archaeological Survey of Ireland see:. Other information for archaeological monuments in the Republic of Ireland is available at
The Republic of Ireland survey lists hillforts, hilltop enclosures and promontory forts, with location and summary site descriptions available for many examples. If information for the monument has been digitised, a brief description of the hillfort is accessible, although site plans are not available. Other information may be available in the County Archaeological Inventory publications for Ireland. This web-GIS also provides various background layers which can be toggled on/off. These include historic Ordnance Survey mapping (1st and 2nd editions and 6-inch and 25-inch scale), vertical aerial photography and Discovery series mapping. A similar digital archive of aerial photography and OS maps are available at Ordnance Survey Ireland’s website (
There are a number of site specific publications which contain detailed plans of some hillforts, for example the Discovery Programme’s ‘Western Stone Forts Project’, ‘North Munster Project’ and ‘Ballyhoura Hills Project’ publications (see ).
A listing of hillforts for Northern Ireland is contained in the Northern Ireland Sites and Monuments Record (see).
Castell Henllys, Pembrokeshire:
The Hillfort Study Group:
Burrough Hill, Leicestershire:
Moel y Gaer, Bodfari, Denbighshire
Heather and Hillforts Project, Denbighshire
The Hillforts of the Ridgeway Project, Oxfordshire:
Ham Hill, Somerset:
Hillforts in the Strathearn area, Perth and Kinross, Scotland:
The Caterthuns, a film by Kieran Baxter:
Note: all web addresses were checked in June 2017.