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An Iron Age religious site and associated enclosures on Gallows Hill, Thetford, immediately to the north of Fison Way industrial estate

A Scheduled Monument in Thetford, Norfolk

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Latitude: 52.4314 / 52°25'53"N

Longitude: 0.745 / 0°44'41"E

OS Eastings: 586711.115466

OS Northings: 285035.300776

OS Grid: TL867850

Mapcode National: GBR RD1.H58

Mapcode Global: VHKCC.V4QX

Entry Name: An Iron Age religious site and associated enclosures on Gallows Hill, Thetford, immediately to the north of Fison Way industrial estate

Scheduled Date: 1 September 2009

Source: Historic England

Source ID: 1021416

English Heritage Legacy ID: 35550

County: Norfolk

Civil Parish: Thetford

Built-Up Area: Thetford

Traditional County: Norfolk

Lieutenancy Area (Ceremonial County): Norfolk

Church of England Parish: Thetford St Cuthbert

Church of England Diocese: Norwich


The monument includes the buried remains of three phases of a ritual or
ceremonial enclosure dating to the Late Iron Age; also associated with these
are further enclosures, ring ditches and other features.

Gallows Hill lies to the north of and 35m above Thetford and the confluence
of the Rivers Thet and Little Ouse. The monument is centrally placed on the
broad, flat plateau that forms the top of the hill, the soils of which
consist of blown sands and outwash gravels covered by a thin layer of
topsoil. The site is crossed from north to south by the Icknield Way, and its
location commands a strategic position overlooking the river crossings, with
broad views on all sides, particularly to the south and west. It lay within
the territory occupied in the Iron Age by the tribal group known as the

The three enclosure ditches were first identified from aerial photographs
taken in 1973, but it was not until 1980 that their significance was
recognized, following discoveries made the previous year. In 1979 the removal
of topsoil in advance of construction of the Travenol factory to the south of
the monument revealed a complex of gullies, pits and ditches. Tiles and brick
were also found, concentrated on 30 square metres in the north west corner of
the factory site but spread over a wider area, where metal detectorists
attracted to the site also found thousands of late Roman coins. The most
spectacular find, a hoard of gold jewelry and silver spoons, the majority
engraved with dedications to the god Faunus, was not revealed by the finder
until the following year. This hoard was named the Thetford Treasure, and is
now in the British Museum.

The nature of the hoard, and the finds from the wider area, suggested that
the site revealed in the course of construction of the factory was a
Romano-Celtic temple. This interpretation aroused greater interest in the
enclosures immediately to the north, which had by chance been photographed
again in the same year. As the whole of this area had been designated for
further development of the Fison Way industrial estate it was decided to
conduct a programme of investigation, including survey and excavation. Over
the next two years the whole of the area containing the triple ditched
enclosure revealed by aerial photography was stripped of topsoil, except for
the south west corner; all visible features were planned and about 5% of the
whole was excavated.

The excavation demonstrated that apart from some prehistoric activity, most
features could be divided between three phases of the site's development. The
first can be assigned to a period before the Roman invasion of AD 43, the
second and third to the decades following, when the Iceni had become a client
kingdom of the invading Romans. This phase of occupation ended in the early
AD 60s, and the site remained unoccupied until the 3rd and 4th centuries. The
sudden abandonment of a site of this scale and significance around the time
of Boudicca's revolt of AD 60 and its suppression strongly suggests a
connection between the two events.

The earliest structural remains consist of a late Neolithic/Early Bronze Age
pit, and five Bronze Age cremations. In this period the landscape was cleared
of its tree cover, and by the Iron Age the hill top had already been
colonized by heath. This was the setting for the first main phase of
pre-Roman development, represented by a series of rectangular and trapezoidal
enclosures, ditches and two groups of pits. Of the three main enclosures, the
most intact, measuring approximately 60m x 60m, lies immediately to the north
of the later Phase II enclosure; phosphate analysis indicates that their use
was not agricultural. Pottery associated with this phase suggests that its
beginnings lay sometime between the 4th and 2nd centuries BC.

The second phase, datable to the mid AD 40s, saw a dramatic increase in both
the scale and intensity of occupation at the site. A substantial double
ditched enclosure was constructed, the outer ditches describing an area about
100m square, with an entrance in the centre of its east side: between the
inner and outer ditch there seems to have been a slight rampart, with a fence
embedded in it. Access to the centre of the monument was controlled through
parallel fences flanking the entrance, and between two substantial posts that
lay just inside the ends of the outer ditch. Directly opposite the entrance,
but slightly to the west of centre, lay a circular building represented by an
eaves drip gully measuring 13m in diameter, within which were an outer circle
of wall posts and an inner of roof posts: the entrance was to the east.

A secondary rectangular enclosure, with a separate entrance also in its east
side, was later added to the south of the double ditched enclosure. Further
enclosures to the west are both earlier than and contemporary with the double
ditched enclosure. Clustered around it to the north and north west are a
group of enclosures and ring ditches, some of which contain rectangular, body
sized features which have been interpreted as graves, despite the fact that
no organic matter, including bone, survives in these soils. Evidence of
metalworking, crucibles for casting in bronze, and pellet moulds for the
production of silver blanks for coins, is also associated with this phase.

Sometime in the AD 50s, this enclosure was swept away and replaced with a
much larger double ditched construction: this is Phase III. This was done by
backfilling the inner ditch and the east arm of the outer ditch and extending
this side of the enclosure eastwards to form a rectangle. A new outer ditch
was then dug to enclose the whole in a rectangle measuring about 220m x 160m.
Not only was it enlarged to enclose over twice the original area, its impact
was enhanced by the addition of a thicket of fences, up to nine deep, which
filled the space between the inner and outer ditches: this has been described
as 'an artificial oak grove', a reference to contemporary descriptions of
Celtic religious practice taking place within sacred groves or woodland
clearings. The approach from the east was along a fenced avenue and through a
gateway constructed of two pairs of substantial posts set between the inner
rampart and inner ditch. The avenue extends beyond the excavated area: it can
be seen on aerial photographs continuing into the field to the east, where
there are also smaller enclosure on the same alignment.

Contained within the double ditched enclosure were five circular structures.
The building from Phase II, modified to form a slight elipse with entrances
to east and west, was centrally placed between two similar buildings. To the
east of these were two smaller circular structures, the remains of which are
more ephemeral. There is no evidence that any of these structures had a
domestic function.

This third phase of enclosures was brief. Early in the AD 60s all upstanding
structures were systematically demolished, with posts either dug out or
removed by rocking to and fro, distorting post holes from round to oval.

For the next two hundred years the site remained unoccupied. The ditches of
the Phase III enclosure were still partially open at this date, and remained
so into the 4th century and beyond. Further features datable to this period
were found in a trench lying south of the main excavation. (Its location is
to the north-east of the factory and immediately to the north of the assumed
find spot of the Thetford Treasure). These include five post holes and two
gullies, interpreted as the fragment of an aisled building.

The scheduling is intended to provide protection for both the enclosures and
features within the excavated area and also those features and areas of
archaeological activity immediately to the north, east and west identified by
aerial photographs, metal detecting and geophysical survey. It includes the
greater part of the field which contains the enclosures as well as that part
of the field to the east which contains the avenue and small enclosure
identified from aerial photographs.

All fences, gate posts and boundary markers are excluded from the scheduling,
although the ground around and beneath them is included.

The site of the monument is shown on the attached map extract.

Source: Historic England

Reasons for Scheduling

The foci of Iron Age religious practice lay in the natural world, in rivers,
wells, lakes and sacred groves, as well as in defined sacred enclosures,
temples and shrines. A small number of the latter have been identified, most
readily recognized where they have been found to precede a Romano-Celtic
temple, that is, in the majority of cases. A minority are located within
hillfort or village settlements.

Iron Age temples or shrines vary in size between 2.5m and 13m. Almost
invariably of post built timber construction, they may be round or square,
generally enclosing a single space, but more rarely containing an inner
chamber and outer ambulatory. The entrance is to the east, and in the
majority of cases they are surrounded by a defined enclosure, with a boundary
formed by a ditch or palisade, or by an undefined open space: where the
shrine was succeeded by a Romano-Celtic temple, both boundary and temple
would usually be reconstructed or replaced in stone. The open enclosure would
probably have been the place where ceremonies were conducted, with the shrine
or temple, often too small for congregational worship, the object of
offerings and individual devotion. About half have produced votive offerings
of a general nature, that is, not identifiable with a specific deity. These
consist mainly of brooches, coins and miniature weapons, as well as animal
bones, presumed to be the remains of sacrifices. The earliest of these
structures associated with ritual and religious practice can be dated to the
4th century BC, the latest to the mid 1st century AD.

The distribution of these sites is through the south and east of England,
with none known north of the south midlands, or in Devon and Cornwall. In
view of their rarity and their potential to contribute to an understanding of
Iron Age religious belief and practice, and to the transition from Iron Age
to Roman culture, all those with surviving archaeological potential should be
considered to be of national importance.

The Late Iron Age site on Gallows Hill is one of the most significant in the
country. The sacred associations of the site are at least as old as the
Bronze Age; we know that activity intensified through the Iron Age into the
early Romano-British period, with a final expression in the 3rd and 4th
centuries AD. The site has much to tell us about the changes in cultural and
religious forms during that time. The main enclosures and the structures they
contain may be interpreted as having a sacred function, and share features in
common with those outlined above. The site was destroyed in the early Roman
period, before it could be allowed to develop into a Romano-Celtic temple,
and is without a known parallel. When religious or ritual activity returned
to the hill top its focus was a building constructed to the south of the
monument, now under the Travenol factory. Coins associated with this period
of activity were found in an area to the west of the enclosures and therefore
this area is included in the scheduling.

The successive double ditched enclosures were produced by complex political
and social developments in the early years of the Roman occupation, the
period of Icenian clientship and its violent end. The resources needed for
both Phase II and Phase III structures would have been considerable, and
indicate are indicative both of the power required to control such a project,
and of the significance of its religious and ceremonial purpose. The grandeur
of such a construction demonstrates the benefits gained from the client
relationship by the Icenian elite, and also its risks; it seems probable that
it was resistance to Roman control that brought about its destruction as an
act of reprisal, the removal of a symbolic focus of Icenian power reinforcing
the suppression of revolt.

Although all visible features were planned in the course of excavation, only
5% were actually excavated. The excavation report acknowledges that the
sample was inadequate, the quality of excavation and supervision at times
poor, and that the area examined was too limited to provide context. Most of
the features within the excavated area therefore remain intact, and the site
still has great potential; future techniques and methods of analysis may
reveal more than can be gleaned at present.

Source: Historic England

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