Atlas of Hillforts of Britain and Ireland

SC2630 Grinan Hill, Perthshire (Grinnan Hill)

Satellite Imagery

Satellite Imagery

HER:  Perth and Kinross Heritage Trust MPK698 (None)

NMR:  NN 80 NW 6 (25262)

SM:  3088

NGR:  NN 8338 0936

X:  283380  Y:  709360  (OSGB36)

Summary

This fort is situated on a wooded promontory formed by the escarpment overlooking the Keir Burn on the SW side of Braco. The defences comprise three ramparts with external ditches drawn in an arc across the N and E approaches to form an oval enclosure, though the inner has been reduced to little more than a scarp, and all three have been obliterated in the central sector of the arc. The only recorded measurements of the interior are supplied by David Christison, who estimated it at about 60m by 50m (0.24ha). Likewise, Christison provides the only observation of an entrance, placing it on the E along the S margin of the promontory, though both his (1900, 54-5, fig 15) and General Roy's earlier plan (1793, pl xxxi) also appear to show a trackway descending obliquely down the escarpment on this flank of the promontory. The interior is featureless.

Status

Citizen Science:  ✗

Reliability of Data:  Confirmed

Reliability of Interpretation:  Confirmed

Location

X:  -432403  Y:  7610834  (EPSG: 3857)

Longitude:  -3.884343490242855  Latitude:  56.262419940095675  (EPSG:4326)

Country:  Scotland

Current County or Unitary Authority:  Perth & Kinross

Historic County:  Perthshire

Current Parish/Community/Council/Townland:  Ardoch

Monument Condition

None

Condition:
Extant   ✓
Cropmark   ✗
Likely Destroyed   ✗

Land Use

None

Current Use:
Woodland   ✓
Commercial Forestry Plantation   ✗
Parkland   ✗
Pasture (Grazing)   ✗
Arable   ✗
Scrub/Bracken   ✗
Bare Outcrop   ✗
Heather/Moorland   ✗
Heath   ✗
Built-up   ✗
Coastal Grassland   ✗
Other   ✗

Landscape

Hillfort Type

None

Type:
Contour Fort   ✗
Partial Contour Fort   ✗
Promontory Fort   ✓
Hillslope Fort   ✗
Level Terrain Fort   ✗
Marsh Fort   ✗
Multiple Enclosure Fort   ✗

Topographic Position

Position:
Hilltop   ✗
Coastal Promontory   ✗
Inland Promontory   ✓
Valley Bottom   ✗
Knoll/Hillock/Outcrop   ✗
Ridge   ✗
Cliff/Plateau-edge/Scarp   ✗
Hillslope   ✗
Lowland   ✗
Spur   ✗

Dominant Topographic Feature:  None

Aspect:
North   ✗
Northeast   ✗
East   ✗
Southeast   ✗
South   ✗
Southwest   ✗
West   ✗
Northwest   ✗
Level   ✓

Altitude:  120.0m

Boundary

N/A


Dating Evidence

In the absence of excavation, there are neither stratified artefacts nor radiocarbon dates to provide a chronology for the defences.

Reliability:  D - None

Principal Activity:
Pre 1200BC   ✗
1200BC - 800BC   ✗
800BC - 400BC   ✗
400BC - AD50   ✗
AD50 - AD400   ✗
AD400 - AD 800   ✗
Post AD800   ✗
Unknown   ✓

Other Activity:
Pre Hillfort:   None
Post Hillfort:   None

Evidence:No related records

Investigation History

None

Investigations:
1st Identified Map Depiction (1755):   Shown on William Roy's Military Survey (1747-55)
Earthwork Survey (1793):   Plan by General William Roy (1793, pl xxxi)
Other (1863):   Annotated Fort in Roman Type on the 1st edition OS 25-inch map (Perth and Clackmannan 1866, sheet 117.10)
Earthwork Survey (1899):   Sketch-plan and description by David Christison (1900, 54-5, fig 15)
Other (1943):   Noted by OGS Crawford prior to 1943 and probably 1937 (1949, 39)
Other (1957):   Description for the RCAHMS Survey of Marginal Lands
Other (1967):   Resurveyed at 1:2500 by the OS
Other (1972):   Scheduled

Interior Features

Featureless

Water Source

None

Source:
None   ✓
Spring   ✗
Stream   ✗
Pool   ✗
Flush   ✗
Well   ✗
Other   ✗

Surface

None

Interior Features (Surface):
No Known Features   ✓
Round Stone Structures   ✗
Rectangular Stone Structures   ✗
Curvilinear Platforms   ✗
Other Roundhouse Evidence   ✗
Pits   ✗
Quarry Hollows   ✗
Other   ✗

Excavation

None

Interior Features (Excavation):
No Known Excavation   ✓
Pits   ✗
Postholes   ✗
Roundhouses   ✗
Rectangular Structures   ✗
Roads/Tracks   ✗
Quarry Hollows   ✗
Other   ✗
Nothing Found   ✗

Geophysics

None

Interior Features (Geophysics):
No Known Geophysics   ✓
Pits   ✗
Roundhouses   ✗
Rectangular Structures   ✗
Roads/Tracks   ✗
Quarry Hollows   ✗
Other   ✗
Nothing Found   ✗

Finds

None

Interior (Finds):
No Known Finds   ✓
Pottery   ✗
Metal   ✗
Metalworking   ✗
Human Bones   ✗
Animal Bones   ✗
Lithics   ✗
Environmental   ✗
Other   ✗

Aerial

Obscured by trees

Interior Features (Aerial):
APs Not Checked   ✗
None   ✓
Roundhouses   ✗
Rectangular Structures   ✗
Pits   ✗
Postholes   ✗
Roads/Tracks   ✗
Other   ✗

Entrances

See main summary

Total Number of Breaks Through Ramparts:  
0:   None

Number of Possible Original Entrances:  
2:   Probably on the E

Guard Chambers:  ✗

Chevaux de Frise:  ✗

Entrances:No related records

Enclosing Works

Three ramparts and ditches cutting off a promontory

Enclosed Area:
Area 1:   0.24ha.
Total:   0.24ha.

Total Footprint Area:  Noneha.

Ramparts

None

Multi-period Enclosure System:
✗   None

Ramparts Form a Continuous Circuit:
✗   None

Number of Ramparts:  
NE Quadrant:   3
SE Quadrant:   0
SW Quadrant:   0
NW Quadrant:   0
Total:   3

Morphology

Current Morphology:
Partial Univallate   ✗
Univallate   ✗
Partial Bivallate   ✗
Bivallate   ✗
Partial Multivallate   ✓
Multivallate   ✗
Unknown   ✗

Detailed Morphology:
Partial Univallate   ✗
Univallate   ✗
Partial Bivallate   ✗
Bivallate   ✗
Partial Multivallate   ✗
Multivallate   ✗

Surface Evidence

None

Enclosing Works (Surface):
None   ✗
Earthen Bank   ✓
Stone Wall   ✗
Rubble   ✗
Wall-walk   ✗
Evidence of Timber   ✗
Vitrification   ✗
Other Burning   ✗
Palisade   ✗
Counter Scarp Bank   ✗
Berm   ✗
Unfinished   ✗
Other   ✗

Excavated Evidence

None

Enclosing Works (Excavation):
None   ✗
Earthen Bank   ✗
Stone Wall   ✗
Murus Duplex   ✗
Timber-framed   ✗
Timber-laced   ✗
Vitrification   ✗
Other Burning   ✗
Palisade   ✗
Counter Scarp Bank   ✗
Berm   ✗
Unfinished   ✗
No Known Excavation   ✓
Other   ✗

Other

Gang Working:
✗   None

Ditches:
✓   None

Number of Ditches:  3

Annex:
✗   None

References

Christison, D (1900) 'The forts, "camps", and other field-works of Perth, Forfar and Kincardine'. Proc Soc Antiq Scot 34 (1899-1900), 43-120

Crawford, O G S (1949) Topography of Roman Scotland north of the Antonine Wall. Cambridge

Roy, W (1793) The Military Antiquities of the Romans in Britain. London



Terms of Use

This work is licensed under CC BY-SA 4.0 and should be cited as:

Lock, Gary and Ralston, Ian. 2024. Atlas of Hillforts of Britain and Ireland. Available at: https://hillforts.arch.ox.ac.uk


Document Version 1.1