Buckinghamshire Grim's Ditch: 1.02km long section from west of White House Farm to Lily Bank Farm


Heritage Category: Scheduled Monument

List Entry Number: 1020886

Date first listed: 18-Aug-1936

Date of most recent amendment: 09-Sep-2003


Ordnance survey map of Buckinghamshire Grim's Ditch: 1.02km long section from west of White House Farm to Lily Bank Farm
© Crown Copyright and database right 2019. All rights reserved. Ordnance Survey Licence number 100024900.
© British Crown and SeaZone Solutions Limited 2019. All rights reserved. Licence number 102006.006.
Use of this data is subject to Terms and Conditions.

The above map is for quick reference purposes only and may not be to scale. For a copy of the full scale map, please see the attached PDF - 1020886 .pdf

The PDF will be generated from our live systems and may take a few minutes to download depending on how busy our servers are. We apologise for this delay.

This copy shows the entry on 23-Jan-2019 at 17:36:41.


The building or site itself may lie within the boundary of more than one authority.

County: Buckinghamshire

District: Wycombe (District Authority)

Parish: Lacey Green

National Grid Reference: SP 82859 00971


Legacy Record - This information may be included in the List Entry Details.

Reasons for Designation

Linear boundaries are substantial earthwork features comprising single or multiple ditches and banks which may extend over distances varying between less than 1km to over 10km. They survive as earthworks or as linear features visible as cropmarks on aerial photographs or as a combination of both. The evidence of excavation and study of associated monuments demonstrate that their construction spans the millennium from the Middle Bronze Age, although they may have been re-used later. The scale of many linear boundaries has been taken to indicate that they were constructed by large social groups and were used to mark important boundaries in the landscape; their impressive scale displaying the corporate prestige of their builders. They would have been powerful symbols, often with religious associations, used to define and order the territorial holdings of those groups who constructed them. Linear earthworks are of considerable importance for the analysis of settlement and land use in the Bronze Age; all well preserved examples will normally merit statutory protection.

The feature known as the Buckinghamshire and Hertfordshire Grim's Ditch includes a series of three prehistoric linear earthworks aligned along the scarp face of the Chiltern Hills between Bradenham and Berkhamstead, together spanning a distance of some 18km. It does not appear that these principal sections were ever joined to form a continuous boundary. Current evidence suggests that the sometimes quite sizeable gaps represent areas which were formerly forested or in which natural features served to perpetuate a division of the land. The same pattern has been discerned along the North Oxfordshire Grim's Ditch, a separate monument to the west of the River Thames. A further comparable linear boundary, the Moel Ditch, extends to the east across parts of neighbouring Bedfordshire. For the most part the visible sections of Grim's Ditch in the Chilterns include a wide single ditch flanked on the south side by a bank of upcast earth overlying a turf core. Excavations carried out in 1973 and 1991 in the parishes of Tring and Northchurch in Hertfordshire identified a berm between the bank and ditch, over which the bank later spread. In one excavation a narrow trench, possibly dug to support a palisade or fence, was discovered along the edge of the ditch furthest from the bank. The Buckinghamshire and Hertfordshire Grim's Ditch is thought to have served as a territorial boundary, separating, and perhaps enclosing organised groups of land and settlement. It may also have been an agricultural boundary, denoting grazing areas and impeding the movement (or theft) of stock. Excavations to date have provided only limited dating evidence. Pottery recovered from the fill of the ditch indicates that that it was in existence in the Iron Age, although it may have a considerably earlier origin. As such, the boundary provides important evidence for the management of the landscape in the centuries preceding the Roman Conquest in AD 43. It remained a notable feature in later centuries, acquiring its present name (a variation on the name of the god, Odin) at some point in the early medieval period, perhaps during the period of pagan Saxon settlement in the 5th and 6th centuries. The earliest recorded use of the term `Grim's Ditch' occurs in a charter granted by Edward, Earl of Cornwall in 1291. All sections of the Buckinghamshire and Hertfordshire Grim's Ditch which survive in visible form or as well-preserved buried remains (identified by aerial photography or ground survey) are considered integral to a general understanding of the monument and will normally merit statutory protection. The section of Grim's Ditch between a point west of White House Farm and Lily Bank Farm survives well as a visible earthwork along most of its length and provides a valuable insight into the nature of early territorial land division in the Chiltern Hills. It will contain archaeological evidence for the manner of its construction as well as environmental evidence for the appearance of the landscape in which it was built. The archaeological evidence may also include either artefacts or scientific dating material from which to determine the period of its construction and the duration of its maintenance as an active boundary.


Legacy Record - This information may be included in the List Entry Details.


The monument includes a 1.02km long section of a prehistoric linear boundary known as the Buckinghamshire Grim's Ditch running broadly south west to north east from a point west of White House Farm towards Lily Bank Farm. It is situated on a ridge of high ground which falls away at either end of this section of Grim's Ditch. The Buckinghamshire Grim's Ditch survives as a clearly visible bank and ditch along all but the central section of this length. Here the ditch survives but the bank is intermittent, having been partially levelled by cultivation over the years. At the south west and north east ends of this section, the earthwork has been cut away by later extraction pits. The section of Grim's Ditch includes a ditch, up to 8m wide, which has been partially infilled over the years and now has a maximum depth of 1.2m. The surviving sections of parallel bank, on the north west side of the ditch, measure up to 5m wide and 0.5m in height. Excavations along other sections of Grim's Ditch in Hertfordshire, carried out in 1973 and 1991, produced evidence of a level area, or berm, separating the bank and ditch. Evidence for a palisade trench, which would have supported a wooden fence, was also found along the outer edge of the ditch. These components are thought to survive as buried features along this section of Grim's Ditch. The ditch was subsequently adopted as a trackway between Lacey Green and Parslow's Hillock. It has been in use as a bridlepath since at least 1823 when it was marked as such on the Princes Risborough Enclosure map. All fences, gates and stiles are excluded from the scheduling, although the ground beneath them is included.

MAP EXTRACT The site of the monument is shown on the attached map extract. It includes a 2 metre boundary around the archaeological features, considered to be essential for the monument's support and preservation.


The contents of this record have been generated from a legacy data system.

Legacy System number: 35334

Legacy System: RSM


Title: The Princes Risborough Inclosure Map Source Date: 1823 Author: Publisher: Surveyor: BRO: IR/87/Q

End of official listing