Trial trenching at Pembroke Castle

In 2016, geophysical survey by Neil Ludlow and Dyfed Archaeological Trust (DAT) revealed the remains of long-vanished buildings, and other features, at Pembroke Castle. This work would not have been possible without the Castle Studies Trust, which funded the entire project.

Pembroke is famous for its large round keep, built by earl William Marshal, and a complex of other stone buildings is preserved in the inner ward. But the large, outer ward has been an empty space since at least the eighteenth century. Nevertheless, very dry summers had revealed ‘parchmarks’ here, showing that ruined walls lay just below the surface. These showed up particularly well during 2013 when they were photographed by Toby Driver of the Royal Commission on Ancient and Historical Monuments (Wales), and were published by Toby, with Neil Ludlow, in Archaeology in Wales.

This was the genesis of the current programme of investigation at the castle. The geophysics that followed used a combination of magnetometry, resistivity and Ground Penetrating Radar, to confirm the parchmark evidence and also show that a number of further buildings, and other features, formerly lay in the outer ward. The most exciting of these is a large building which may represent a free-standing, double-winged mansion-house from the late Middle Ages. If so, it would be quite exceptional: grand buildings of this particular kind are unusual in castles, and particularly in outer wards which are normally thought to have contained the more lowly buildings associated with everyday castle life.  It means that the outer ward, at Pembroke, may have been ‘gentrified’ – at least in the fifteenth century. This may make sense of historical accounts which place the birth of the future king Henry VII in the outer ward: it may have occurred within this very building.

What the geophysics and parchmarks seem to show is a large, central hall, flanked by two wings. If the building was anything like others of its kind, one wing will have contained the kitchen and ‘services’ – the buttery and pantry – while the other represented more private accommodation. The outer ward was partly excavated in the 1930s – sadly, without record – but a photograph shows a large, stone-lined pit, apparently leading off the hall, which may be the cess-pit mentioned in an account from the period. A square annexe showed up here in the survey work.

Just inside the castle beside Pembroke’s main gate are parchmarks (where the white tents are). They show the position of a late medieval hall. ©Neil Ludlow

While the results showed what can be achieved through geophysics – and generous grant-aid – their interpretation is, at the moment, still speculation. Only educated guesses can be made about the exact form, date and function of the building. But it has the potential to make a big contribution to the study of castles, and late medieval history, at a national level. So Neil got together with James Meek of DAT to decide how best to get answers to these questions. Only excavation could really provide the answers but, given the sensitivity of the site, which is a Scheduled Ancient Monument, and the importance of the building, minimum intervention, for now, was the preferred approach – a small excavation, primarily just to see how much has survived. This was agreed by Cadw, who granted permission for the hand-excavation of two trial trenches, one across the hall and possible cess-pit, the other across one of the wings. Overburden will be removed, and hopefully the remains of the medieval walls, and any floor-surfaces, will be revealed. It is not intended to go down any further – or at least, not in the present project which will effectively be an evaluation.

We also don’t know how much was removed during the 1930s excavation. While we know there must still be walling, as it shows up in the geophysics and parchmarks, it is possible that the medieval floors may have gone. We hope not, and we also hope that the cess-pit wasn’t emptied, as its deposits could contain valuable information on diet, health, bugs and parasites, while finds that are important to us may have been dumped there as rubbish.

Neil and DAT decided once again to approach the Castle Studies Trust who, very generously, again awarded a grant for the work. This will be supported by help in kind from Pembroke Castle Trust. One of the things also missing at Pembroke is a really accurate measured ground plan, with levels, so for the first time a full topographic survey will also be undertaken. We hope the castle can be persuaded to reveal a few more of its secrets.

Possible layout of the winged building in Pembroke’s outer ward,
based on Cothay Manor, Somerset, and others. ©Neil Ludlow

Don’t miss out on more news from our projects. We’ll have regular updates from Pembroke on our social media, and if you haven’t already please subscribe to our quarterly newsletter. We are entirely reliant on donations, so please consider giving to support our work.

The six projects we’re funding this year

From 15 high quality applications we had to choose which ones we could fund. It certainly wasn’t an easy decision, but we have managed to support six different projects – the most we’ve supported in a single year – with a total of £22,000. You can learn more below, and if you would like to hear about the results when they are ready be sure to sign up to our newsletter.

Old Bolingbroke, Lincolnshire, England

Photo by David Hitchborne, licensed CC BY-SA 2.0.

Bolingbroke Castle was built by the Earl of Chester in the 1220s and Henry IV was born here in 1367. It is unclear how the Rout Yard and Dewy Hill were used, so Heritage Lincolnshire will carry out geophysical surveys at the castle to find out more about the site.

Pembroke, Pembrokeshire, Wales

Photo by ‘Jez‘, licensed CC BY-SA-NC-ND 2.0.

Founded in 1093, Pembroke is the oldest castle out of this year’s projects. Rebuilt by William Marshall, one of the most famous knight of his age, the castle was also the birthplace of Henry VII. Neil Ludlow and James Meek’s project will excavate in the outer ward to find out more about a late medieval hall. We also funded a geophysical survey at the castle in 2016.

Dig It!, castles of southern Scotland

With funding from the Castle Studies Trust Dig It! will be producing a series of eight videos exploring castles in southern Scotland, and sharing them with an online audience. By making it easier to access information about these important historic sites through YouTube and Wikipedia the project aims to inspire the next generation of castle enthusiasts!

Keith Marischal, East Lothian, Scotland


The Castle of Keith belonged to the powerful Keith family. The castle has since been demolished, with some parts built into Keith Marischal House which now stands on the site. Miles Kerr-Peterson and and Rose Geophysical Consultants will be carrying out a geophysical survey to search for the castle’s lost tower and great hall.

Laughton-en-le-Morthen, South Yorkshire, England


The castle is undocumented in medieval sources, but the earthworks of the motte-and-bailey castle are impressive: the motte itself is 9m tall. To find out more about Laughton-en-le-Morthen Castle, Duncan Wright will be carrying out a geophysical and aerial survey.

Ruthin, Denbighshire, Wales

Photo by Eirian Evans, licensed under a CC BY-SA 2.0 licence.

First documented in 1277, Ruthin Castle was controlled by Reginald de Grey in 1282. This once great castle is a ruin today and much in need of interpretation. To help with this, Chris Jones-Jenkins will create a digital reconstruction of Ruthin. Chris also worked on the reconstruction of Holt Castle, which was built around the same time some 18 miles to the east.

Stay in touch!

We will have updates from these projects throughout the year. Be sure to subscribe to our newsletter so you don’t miss out.

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Another Bumper Crop of Applications for the Castle Studies Trust to Consider

The deadline for grant applications passed on 15th December. We’re going through the various projects now. Altogether the 15 projects, coming from all parts of Britain, are asking for over £63,000. They cover not only a wide period of history but also a wide range of topics. For a little more detail, here are the applications we’ve received:

  • Caldicot, Wales – a geophysical survey of the scheduled area of Caldicot Castle using magnetometry, resistivity, and Ground Penetrating Radar (GPR)
  • Dig It! 2017 Castles of South Scotland – enhancing public understanding and knowledge of some castles in southern Scotland, their purpose, their history and their relevance, particularly the lesser-known and least visited sites.
  • Dunyvaig, Scotland – co-funding a project to provide better understanding of the landscape context of the castle by conducting detailed topographic and geophysical surveys and carrying out trial trenching to gain key information regarding the preservation and the depth of the buried deposits.
  • Keith Marischal, Scotland – geophysical survey at Keith Marischal House, in search of a lost medieval castle and renaissance palace with a great hall reputed to be second in size to that of Stirling’s.
  • Lathom, England – excavations to find out the true size of Lathom Castle. You may recognised them from 2017’s grants when we funded analysis of masonry recovered from excavations between 1997 and 2009.
  • Laughton-en-le-Mortain, England  comprehensive archaeological investigation of the motte and bailey castle of Laughton-en-le-Morthen, South Yorkshire and its surrounding landscape.
  • Loch Kinord, Castle Island, Scotland – radiocarbon dating an early island castle: Castle Island, Loch Kinord, Aberdeenshire
  • Old Bolingbroke, England – revealing the history of Old Bolingbroke’s Castles: What can researching Bolingbroke Castle’s Route Yard and Dewy Hill tell us about Bolingbroke Castle?
  • Pembroke, Wales – test trenches at one of Wales’ greatest castles to confirm the site of the late medieval structure revealed in the geophysical survey funded by the CST in 2016.
  • Ruthin Denbighshire – co-funding reconstruction drawing of this great Welsh Edwardian fortress. Ruthin was the town where Owain Glyndwr’s rebellion against English rule started.
  • Sheffield, England – record and examine the architectural fragments stored on the site of the castle found in previous excavations.
  • Skipton, England – an archaeological/architectural survey will be produced of the gate structures and flanking round towers of the inner ward of Skipton Castle.
  • Snodhill, England – geophysical survey and excavations to answer some key remaining questions of this important Welsh border fortress re: the castle namely where was the entrance and function of the North Tower.

The applications have been sent to our expert assessors who will go over them. You can see how the assessment process works in one of our earlier blogs.