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Historic England Research Records

Grimsbury Castle

Hob Uid: 237396
Location :
West Berkshire
Hermitage
Grid Ref : SU5109072210
Summary : Iron Age univallate hillfort covering some 3.3ha. There are two entrances, that to the west with an outwork which may incorporate part of an earlier enclosure. Excavations on the defences in 1957-60 revealed two periods of construction, the bank possibly reinforced with a timber palisade subsequently strengthened by a flint wall. Iron Age pottery was recovered. Within the interior are six or seven pillow mounds which were excavated in circa 1860 but without result.
More information : [SU 5110 7226] Grimsbury Castle [T.I.] Hill fort [G.T.] (1)

An Iron Age hill fort with a well preserved double bank and
ditch following the contour of the hill.

There are two entrances, one to the north east, with and
additional bank to the north west of the approach road, and
another to the west. An extra ditch some [100] yards away
protects the west side.

J.B.A.A (4) refers to six or seven mounds, twenty feet long by
twelve feet wide, inside the earthwork. They were excavated
circa 1860 and nothing found. [These mounds are not mentioned
in (2) and (3)].

A section of the defences was excavated by P.Wood in 1958,
nothing of importance being found. further work may be
undertaken. [Plan AO:62:292:3] (5). (2-5)

Further excavations in 1960 were confined to the inner, north,
side of the western entrance. This simple entrance, possibly
reinforced by a timber palisade, shows evidence of two periods
of construction, being subsequently strengthened by a flint
wall. Pottery found was second 1A 'A' and Southern Second 'B'
[Full report to be published in Trans. Newbury F.C.]. (6)

Re-surveyed at 1:2500.

The outwork to the west of the hill appears to be of two
periods of construction, the northern, and apparently earlier,
part was possibly a stock enclosure, but the southern section
is of defensive character.

The mounds mentioned by Authy.4 are pillow mounds. (7)

Additional reference. (8)

SU 513723, SU 510723, SU 509720. Grimsbury Castle. Scheduled. (9)

SU 511 723. Grimsbury. Listed in gazetteer as a univallate hillfort covering 3.3ha. (10)

Grimsbury Castle. Account of sectioning of rampart by P Wood. This is specified as having taken place in 1957 [see authy. 5]. The fort itself is described as a univallate structure. (11)

The Iron Age fort, described by the previous authorities, is visible as earthworks, through trees, on aerial photographs. (12)

Sources :
Source Number : 1
Source :
Source details : OS 6" 1960
Page(s) :
Figs. :
Plates :
Vol(s) :
Source Number : 2
Source :
Source details : (HTE Peake)
Page(s) : 257-8
Figs. : PLAN
Plates :
Vol(s) :
Source Number : 11
Source :
Source details : (P Wood)
Page(s) : 74-82
Figs. :
Plates :
Vol(s) : 57, 1959
Source Number : 12
Source :
Source details : FSL 6512 274-5 03-MAR-1965
Page(s) :
Figs. :
Plates :
Vol(s) :
Source Number : 3
Source :
Source details : Archaeology of Berkshire, 1931, 68, 199 (H Peake)
Page(s) :
Figs. :
Plates :
Vol(s) :
Source Number : 4
Source :
Source details :
Page(s) : 229-30
Figs. :
Plates :
Vol(s) : 16, 1860
Source Number : 5
Source :
Source details :
Page(s) : 284
Figs. :
Plates :
Vol(s) : 6 No 12, 1960
Source Number : 6
Source :
Source details : Excavation at Grimsbury Castle, 1960 MS (PO Wood)
Page(s) :
Figs. :
Plates :
Vol(s) :
Source Number : 7
Source :
Source details : F1 GHP 28-MAY-63
Page(s) :
Figs. :
Plates :
Vol(s) :
Source Number : 8
Source :
Source details :
Page(s) : 137, 207
Figs. :
Plates :
Vol(s) :
Source Number : 9
Source :
Source details : DOE (IAM), SAMs 1988 Berkshire 3
Page(s) :
Figs. :
Plates :
Vol(s) :
Source Number : 10
Source :
Source details :
Page(s) : 212
Figs. :
Plates :
Vol(s) : 62

Monument Types:
Monument Period Name : Iron Age
Display Date : Iron Age
Monument End Date : 43
Monument Start Date : -800
Monument Type : Univallate Hillfort, Findspot
Evidence : Earthwork, Sub Surface Deposit
Monument Period Name : Medieval
Display Date : Medieval
Monument End Date : 1540
Monument Start Date : 1066
Monument Type : Pillow Mound
Evidence : Earthwork

Components and Objects:
Period : Iron Age
Component Monument Type : Univallate Hillfort, Findspot
Object Type :
Object Material : Pottery

Related Records from other datasets:
External Cross Reference Source : Scheduled Monument Legacy (County No.)
External Cross Reference Number : BK 105
External Cross Reference Notes :
External Cross Reference Source : National Monuments Record Number
External Cross Reference Number : SU 57 SW 6
External Cross Reference Notes :

Related Warden Records :
Related Activities :
Associated Activities :
Activity type : EXCAVATION
Start Date : 1860-01-01
End Date : 1860-12-31
Associated Activities :
Activity type : EXCAVATION
Start Date : 1957-01-01
End Date : 1957-12-31
Associated Activities :
Activity type : EXCAVATION
Start Date : 1960-01-01
End Date : 1960-12-31
Associated Activities :
Activity type : FIELD OBSERVATION (VISUAL ASSESSMENT)
Start Date : 1963-05-28
End Date : 1963-05-28
Associated Activities :
Activity type : AERIAL PHOTOGRAPH INTERPRETATION
Start Date : 1999-01-01
End Date : 2000-12-31
Associated Activities :
Activity type : MANAGEMENT SURVEY
Start Date : 2010-01-01
End Date : 2010-12-31