Castles / GB / Wales
Grosmont Castle
Castell y Grysmwnt
Which definitions does it satisfy?
This dataset does not record whether something “is a castle”. It records a verdict against each named definition, with the reasoning that produced it.
| Definition | Verdict | Basis |
|---|---|---|
| Fortified residence | yes | Curtain wall with three round towers enclosing the inner ward, a gatehouse with a 14th-century drawbridge pit (active defence meant to be held), and a two-storey hall block whose upper floor held the hall and the lord's solar (residence); held by Hubert de Burgh and later the Earl of Lancaster. Both the fortified and private-lordly-residence halves are met. |
| Enclosure fortification | unassessed | No source consulted so far speaks to this definition. Unassessed is not the same as no. |
| State fortification | unassessed | No source consulted so far speaks to this definition. Unassessed is not the same as no. |
| Palatial seat | yes | In the 14th century the castle "ceased to have a military function and was converted to provide suitable accommodation for the Earl of Lancaster", with "larger windows replacing the arrow slits", fireplaces and garderobes added and an elaborate ashlar chimney — defensive fabric relaxed for residential amenity, the retained-relic test for this band. |
| Revival and folly | unassessed | No source consulted so far speaks to this definition. Unassessed is not the same as no. |
| Popularly a castle | unassessed | No source consulted so far speaks to this definition. Unassessed is not the same as no. |
Facts
| Tradition | european medieval |
|---|---|
| Location | Grosmont, Monmouthshire, Wales, GB |
| Built | Medieval |
| Confidence | medium |
| First recorded | 2026-07-21 |
| Last updated | 2026-07-22 |
In the registers
Where this structure appears in official inventories. This is what turns an individual record into evidence about a count.
- Cof Cymru — National Historic Assets of Wales —
MM007· Scheduled Monument — SiteType: Castle · entry
Location
Approximate. © OpenStreetMap contributors.
Notes
Designation report (MM007) assessed. Two bands carry assessed verdicts, for different phases (rule 3): fortified_residence: yes on the medieval defensive fabric and lordly hall, and palatial_seat: yes on the documented 14th-century conversion for the Earl of Lancaster (arrow slits replaced by larger windows, fireplaces and garderobes added). popular_castle omitted — the report shows the "Three Castles" grouping but no visitor-operation or public-standing evidence; state_fortification and revival_folly not spoken to. One report plus register → medium.
Sources
- Scheduled Monument Full Report — Grosmont Castle — Cadw, 2026-07-22
Cadw's full scheduled-monument report (MM007); assessed against the bands.
Signals
Raw per-source observations behind this record (2):
sig-20260721-cadw-mm007,
sig-20260722-report-mm007
Record file · dataset licensed CC BY 4.0 — see provenance.