Red Castle: a medieval ringwork castle overlying Mid-Saxon and early medieval churches, Romano-British, Saxon and medieval settlement remains, and a Late Saxon town ditch

Summary

The earthwork and buried remains of a mid-twelfth century ringwork surrounding the buried remains of an earlier medieval church, as well as the Mid-Saxon timber-framed church that preceded it. The ringwork overlies part of the Late Saxon town ditch together with Early and Mid-Saxon occupation layers, which are distinct from the Late Saxon town, as well as Romano-British occupation remains.

The ringwork lies on the south side of Brandon Road (A134), about 100m south of the Little Ouse River, overlooking the site of a medieval ford, separated from it by a strip of water meadow. It is enclosed on its south, east and west sides by the late-twentieth century Red Castle Furze housing estate. The remains of the Augustinian priory of the Canons of the Holy Sepulchre lie around 370m to the east, and St Mary’s Cluniac priory is centred 550m to the north-east, on the north side of the river, both are seperately scheduled monuments.

The monument is covered by Red Castle Plantation, a publically accessible mixed woodland. The south side opens onto a broad grass verge beside an access road to the housing estate.

Reasons for Designation

The mid-C12 ringwork, the Mid-Saxon and early medieval churches, the Late Saxon town ditch, and the Romano-British, Early and Mid-Saxon occupation layers, variously surviving as earthworks and buried remains at Red Castle Plantation, are scheduled for the following principal reasons:

* Rarity: with only 200 examples of ringworks identified nationally and less than 60 with baileys, Red Castle is a rare surviving example, particularly as one of only five examples of this type of fortification identified in Norfolk;

* Period: as one of a restricted range of Anglo-Saxon fortifications it is of particular significance to our understanding of the period;

* Survival: a large part of it survives well, despite the removal of part of the ditch on the north side by the cutting of the road and some disturbance by sand quarrying;

* Diversity: as the monument exhibits a great diversity both in chronology and types of monument, it is of great importance for the study of the early development of Thetford which, at the time of the Domesday survey, was among the largest and most populous towns in England;

* Potential: the standing and buried earthworks which remain will retain archaeological information relating to their construction, and use, and remains of structures, providing further evidence for the occupation and use of the ringwork are likely to be preserved beneath the later deposits of sand in the interior;

* Documentation: our understanding of ringworks is significantly enhanced by the archaeological investigations undertaken here in the 1960s. The wealth of finds from the site provides important evidence for its chronological development and occupations, including social organisation and cultural practices;

* Group value: the monument is associated with other contemporary and non-contemporary monuments in Thetford, including the scheduled remains of the Cluniac Priory which lie to its east and north-east.

History

Ringworks are substantial but simple earthwork enclosures measuring about 20m to 50m across and roughly circular in plan. They were the earliest Norman castles in England, being built immediately after the Norman Conquest, and were usually defined by an outer ditch, the soil from which was used to form a large inner bank. As such, many ringworks have more of a prehistoric quality than a medieval one. It is often only the scale and the relative sharpness of the earthworks that distinguishes these castles from their prehistoric predecessors.

Ringworks can be divided into two basic forms: a full ring, broken only by a single entrance; and the partial ringwork for which the ditch was cut - and the bank thrown up - across a promontory, the angle of a river terrace, or a narrow neck of land, so as to make best use of the natural defences. Ringworks were economical in construction and were often adapted from earlier structures such as Iron Age hillforts, and even from Roman amphitheatres. Their simplicity was a factor that enabled the fashion for castles to spread so quickly across Britain. Excavation has revealed that some of the encircling banks were revetted with timber posts: these were also used along the passage to the gate, or along the rampart so as to construct a fighting platform. Domestic buildings, also of timber, stood within the enclosure.

The earliest known archaeological investigations at Red Castle following its identification in 1867 were undertaken in 1957-1958 by Group Captain Guy Knocker (Knocker 1967). He excavated several areas within the interior of the ringwork and cut a number of sections through the ditch and bank in order to determine the nature of the earthwork and its relationship with the Anglo-Saxon settlement of Thetford.

Knocker established that the ringwork was built not only across the line of the Late Saxon town ditch but also directly over an early-C11 stone church, which itself had replaced a Mid-Saxon timber church. It is possible that the church was deliberately incorporated into the defences so that its stone structure formed an integral, and potentially defensible, component of the fortification. A pre-Conquest inhumation cemetery associated with the church was also discovered, from which 85 bodies (61 adults and 24 children) were excavated. The alignment of the Late Saxon town ditch to its east suggests that the church lay outside the town defences.

Excavations within the western part of the interior of the ringwork, and more extensive work to the east of it, revealed the remains of timber buildings and associated features dated to the Early and Middle Saxon periods. On the basis of these and other finds, particularly pottery, it is believed that these occupation deposits extended westwards across the area now occupied by Red Castle Plantation, which is included within the scheduling. It is suggested that the Late Saxon town of Thetford evolved from the settlement at Red Castle and expanded to incorporate nearby settlements associated with fords further east along the south bank of the Little Ouse (Dunmore and Carr, 1976, p9). Quantities of Romano-British pottery have also been recovered from this area, indicating the presence of a settlement here during the C1 AD.

Extensive excavations carried out in 1988-1989 in the area immediately to the east of the visible earthwork have shown that there was a semicircular bailey measuring approximately 27m across east-west on that side, enclosed by a ditch about 1.5m deep and 4.3m wide. Its position suggests that it probably protected an entrance on the north-east side (Knocker, 1967, p133). No in-situ bank associated with the bailey ditch survived, but the fills of the ditch are interpreted as the remains of a bank which was deliberately slighted prior to the construction of several structures, perhaps at the end of the C12 or beginning of the C13. A small ditch or gully lying just outside of the bailey ditch, and running parallel to it, may have been either a marking-out ditch or more likely associated with some form of additional defensive arrangement, possibly a palisade trench contemporary with the bailey ditch. This area now underlies a modern housing development and is not included in the scheduling. 

Documentary evidence for the castle is limited, but according to Blomefield (1805, p7-9), the castle belonged to and stood in the fee of William de Warenne, Earl of Surrey, who also founded the nearby Priory of the Holy Sepulchre during the reign of King Stephen, probably soon after 1139. Blomefield gives no reference for this assertion, but if true de Warenne may have also been responsible for the construction of Red Castle, which is believed to have been constructed during the Anarchy of King Stephen’s reign (1135-1154), possibly about 1146 according to Cushion and Davison (2003, p180). As the Late Saxon town defences had probably been infilled at least a century earlier (Rogerson and Dallas, 1984, p63), the siting of Red Castle on the line of the town ditch may have been fortuitous. Nevertheless, its position, like that of the Late Saxon defences, appears related to the nearby fording place on the Little Ouse. A Late Saxon street exposed at Redcastle Furze is believed to have led to this ford, and the route may have remained in use into the medieval period. The ringwork, constructed on the edge of the floodplain and facing north-east, would therefore have been well placed to guard both the ford and the approaching street. The castle would also have occupied a strategic position controlling river traffic and one or more east-to-west land routes out of Thetford (Andrews,1995, p69).

As Red Castle was built during the Anarchy, it was probably only occupied briefly and may have been abandoned once the mid-C12 unrest ended. A small vestry added to the north side of the chancel in the C13 shows that the church remained in use after the ringwork was deserted, though it appears to have been abandoned by the C14. Documentary evidence also suggests that the Late Saxon church was dedicated to St Lawrence rather than St Martin, as previously believed (Dallas, 1993, p212–213).

Details

PRINCIPAL ELEMENTS: The earthwork and buried remains of a mid-C12 ringwork that contains the buried remains of an earlier medieval church, as well as the Mid-Saxon timber-framed church that preceded it. The ringwork overlies part of the Late Saxon town ditch together with Early and Mid-Saxon occupation layers, which are distinct from the Late Saxon town, as well as Romano-British occupation remains.

DESCRIPTION: the ringwork is a sub-circular earthwork with an overall diameter of approximately 120m. It is visible as a flat-topped mound with a broad, raised rim on the west and south-east sides, encircled by a ditch that remains open to a depth of about 1.5m on the west side. On the south and east sides, the ditch has become infilled but survives as a buried feature, while on the north side it has been largely removed by C18 sand and gravel extraction and the C20 improvements to the Brandon Road. Knocker’s excavations in 1957-1958 established that the ditch originally reached a depth of 3m from the contemporary ground surface. It encircled an inner bank about 2m high and 12m wide at its base, constructed of sand and gravel upcast from the ditch. The bank is now partly masked by blown sand that has accumulated against its inner face, raising the surface of the ringwork interior by 0.6m or more above its original level. The excavations also revealed some evidence for a timber palisade on top of the bank, along with the buried remains of a flint 'perimeter track' up to 10m wide immediately inside the bank.

Knocker’s excavations also uncovered the buried remains of the altar and south and east walls of the chancel of a small church situated on the eastern edge of a large sand pit in the northern part of the enclosure, with an associated burial ground to its immediate south and east. Also surviving were a few stones of the chancel’s north wall and the east wall of an adjoining vestry together with the foundations of the south-east angle of the nave and chancel arch; all the rest having been dug away. The walls, which survive to around 0.6m above the original floor level, are faced in regular courses of small clunch stones, initially irregular internally for the first 0.3m or so and then rising in neatly squared blocks with internal quoins bonding with the south wall. A hearth 0.8m in width, cut into natural gravel, which lies beneath the church’s east wall, is believed to be associated with an early Saxon timber church around which the Mid-Saxon stone church was built.

Limited excavations in the western part of the interior of the ringwork, and more extensive work to the east, revealed post holes, hearths and other features belonging to Early and Mid-Saxon timber buildings associated with settlement activity close to the ford. These buried deposits are believed, from finds and observations, to extend westwards across the area now forming Red Castle Plantation, which is included in the scheduling. Romano-British pottery has also been recovered from this area in quantities that indicate a settlement was established here in the C1 AD, the buried remains of which are expected to survive.

Two pairs of parallel flint footings were also recorded within the western interior. One pair (Knocker, 1967, p132), aligned ENE–WSW, comprised two lines of loose flint 4m apart and over 6m long. They were associated with roof and floor tiles and some medieval pottery. This pair, along with a second, less distinct set of footings, indicates the location of two additional buildings, probably timber structures with flint footings, within the ringwork, although whether these date to the C12 or a later period is uncertain.

The ringwork was constructed over part of the western end of the ditch around the Late Saxon town south of the river. The alignment of this ditch has been confirmed by limited excavations to the south of the monument and by observations made during road widening on the north side of the ringwork in 1966. These investigations showed that the later earthworks overlie three successive buried ditches, each 2m-3m deep, with an internal bank, running south to north towards the river. Another ditch about 4.5m wide and 2m deep and containing Late Saxon pottery was located immediately to the west of the ringwork during the 1957-1958 excavations and is thought to represent a branch of the same town ditch.

FINDS: Knocker's excavations yielded a substantial pottery assemblage comprising mostly single sherds, dominated by cooking pots and storage jars, with fewer bowls and dishes. It comprised: 24 Romano-British sherds; 58 Early Saxon sherds; around 200 Mid-Saxon sherds; 181 Late Saxon sherds; and 352 medieval sherds which were all earlier than the C14. Other notable finds include a sceatta coin of the 740s AD, a short-cross penny of King John, minted at Canterbury about 1205, and part of a quern of Mayan lava.

EXTENT OF SCHEDULING: the area of protection is shown on the attached map and is designed to protect the full extent of the mid-12th-century ringwork and an earlier medieval church, as well as the Mid-Saxon timber-framed church that preceded it, together with a section of the Late Saxon town ditch and associated Romano-British and Early- and Mid-Saxon occupation remains.

EXCLUSIONS: the street lamps, street signs, waste bins, telegraph poles and telecommunication street cabinets that stand on the edge of the monument on its north and south sides are excluded from the scheduling, although the ground beneath them is included.

Legacy

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

Legacy System number:

21442

Legacy System:

RSM

Sources

Books and journals
Blomefield, F, An Essay towards a Topographical History of the County of Norfolk, (1805)
Knocker, GM, Excavations at Red Castle, Thetford in Norfolk Archaeology, Vol. 34, (1967), 119-186
Wells, C, Report of the human skeletons from Red Castle, Thetford in Norfolk Archaeology, Vol. 34, (1967), 155-186
Dallas, C, Excavations in Thetford by BK Davison between 1964 and 1970 in East Anglian Archaeology, Vol. 62, (1993), 7-11, 212-3
Batcock, N, The Ruined and Disused Churches of Norfolk in East Anglian Archaeology, Vol. 51, (1991), 55
Cushion, B, Davison, A, Earthworks of Norfolk in East Anglian Archaeology, Vol. 104, (2003), 180
Dunmore, S, Carr, R, The Late Saxon Town of Thetford: An Archaeological and Historical Survey in East Anglian Archaeology, Vol. 4, (1976), 6, 9, 14, 18
Andrews, P, Excavations at Redcastle Furze, Thetford, 1988–9 in East Anglian Archaeology, Vol. 72, (1995), 7-11, 66-69
Rogerson, A, Dallas, C, Excavations in Thetford 1948–59 and 1973–80 in East Anglian Archaeology, Vol. 22, (1984), 60-63
Pevsner, N, Wilson, B, The Buildings of England: Norfolk 2: North West and South, (1999), 713

Websites
Information on Red Castle from the Norfolk Heritage Explorer website, accessed 12 February 2026 from https://www.heritage.norfolk.gov.uk/record-details?MNF5746-Red-Castle-Thetford

Other
Royal Commission on the Historical Monuments of England Survey Report AF0622096, 'Red Castle, Thetford, Breckland, Norfolk' (1987)

End of official list entry

All text content is available under the Open Government Licence v3.0 , except where otherwise stated. Any supplied maps are © Crown Copyright [and database rights] 2026 OS AC0000815036 and may not be reproduced without permission.