The core of Per Lineam Valli is a Google Earth file containing the ditch, curtain wall, turrets, milecastles, forts, Military Way, Vallum, outpost forts, hinterland forts, Cumbrian coastal system, temporary camps, the Stanegate, quarries, and indications of sites worth visiting as separate layers. Geolocated links to the photographs available on the Images page will be added in due course. There are also links to the same information in Google Maps and Microsoft’s Bing Maps, but there are limitations on these that Google Earth does not share.

The principal elements of each layer carry details of the relevant pages within the latest edition of J. Collingwood Bruce’s Handbook to the Roman Wall (which is available from our Bookshop), compiled by Prof. David Breeze; links to the appropriate parts of MAGIC, the UK government mapping base which includes the extent (and details) of scheduled monuments and the Hadrian’s Wall World Heritage Site, and PastScape, the National Monuments Record’s online database; references to documents on the Hadrian’s Wall Research Framework website, where available; images of sites where there is something to see; and, where available, information from Roman-Britain.org.

Additionally, there are pages with more images of the Wall (available under a Creative Commons licence) and details of the major online sources of information on the Wall.

So where does the phrase ‘Per Lineam Valli’ come from? It is used in the Notitia Dignitatum in its list of officers (and their units) ‘along the line of the Wall’.


The body text for this website is Gentium Book Basic whilst the title font is IM Fell English, both freely available through Google’s Web Font initiative. The header image features part of the south face of the curtain wall between Milecastle 49 (Harrow’s Scar) and Birdoswald fort. The first version of Per Lineam Valli can still be found here.

Mike Bishop