Caer y Twr hillfort
E788243
Caer y Twr hillfort is an Iron Age defensive settlement located on the slopes of Holyhead Mountain on Anglesey in Wales.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Caer y Twr hillfort canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9262388 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Caer y Twr hillfort Context triple: [Holyhead Mountain, hasNearby, Caer y Twr hillfort]
-
A.
Old Oswestry Hillfort
Old Oswestry Hillfort is a well-preserved Iron Age hillfort in Shropshire, England, renowned for its extensive earthworks and archaeological significance.
-
B.
Maiden Castle hillfort
Maiden Castle hillfort is an ancient defensive earthwork located within the Lomond Hills of Fife, Scotland, notable for its prehistoric archaeological remains.
-
C.
Bryn Celli Ddu
Bryn Celli Ddu is a Neolithic passage tomb and ceremonial monument on the island of Anglesey in Wales, noted for its prehistoric burial chamber and alignment with the summer solstice sunrise.
-
D.
Restormel Castle
Restormel Castle is a well-preserved circular medieval fortress in Cornwall, England, notable for its picturesque ruins and commanding views over the River Fowey valley.
-
E.
Dinefwr Castle
Dinefwr Castle is a medieval Welsh fortress in Carmarthenshire, historically associated with the princes of Deheubarth and renowned for its picturesque hilltop ruins overlooking the surrounding countryside.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Caer y Twr hillfort Target entity description: Caer y Twr hillfort is an Iron Age defensive settlement located on the slopes of Holyhead Mountain on Anglesey in Wales.
-
A.
Old Oswestry Hillfort
Old Oswestry Hillfort is a well-preserved Iron Age hillfort in Shropshire, England, renowned for its extensive earthworks and archaeological significance.
-
B.
Maiden Castle hillfort
Maiden Castle hillfort is an ancient defensive earthwork located within the Lomond Hills of Fife, Scotland, notable for its prehistoric archaeological remains.
-
C.
Bryn Celli Ddu
Bryn Celli Ddu is a Neolithic passage tomb and ceremonial monument on the island of Anglesey in Wales, noted for its prehistoric burial chamber and alignment with the summer solstice sunrise.
-
D.
Restormel Castle
Restormel Castle is a well-preserved circular medieval fortress in Cornwall, England, notable for its picturesque ruins and commanding views over the River Fowey valley.
-
E.
Dinefwr Castle
Dinefwr Castle is a medieval Welsh fortress in Carmarthenshire, historically associated with the princes of Deheubarth and renowned for its picturesque hilltop ruins overlooking the surrounding countryside.
- F. None of above. chosen
Statements (29)
| Predicate | Object |
|---|---|
| instanceOf |
archaeological site
ⓘ
hillfort ⓘ |
| access | footpath from Holyhead Mountain car park ⓘ |
| category |
Iron Age site in Wales
ⓘ
Prehistoric site in Anglesey ⓘ |
| country | Wales ⓘ |
| elevationRelativeTo | upper slopes of Holyhead Mountain ⓘ |
| hasFeature |
enclosing walls
ⓘ
hut platforms ⓘ stone ramparts ⓘ terraces ⓘ |
| hasViewOf |
Anglesey coastline
ⓘ
linked to:
North Wales coast
Snowdonia mountains ⓘ
linked to:
Snowdonia
|
| heritageDesignation | Scheduled monument ⓘ |
| locatedIn |
Anglesey
ⓘ
Holyhead Mountain ⓘ United Kingdom ⓘ Wales ⓘ |
| material |
earth
ⓘ
stone ⓘ |
| near | Holyhead ⓘ |
| onSlopesOf | Holyhead Mountain ⓘ |
| openToPublic | yes ⓘ |
| overlooks |
Holyhead
ⓘ
Irish Sea ⓘ |
| partOf |
Holyhead Mountain landscape
ⓘ
linked to:
Holyhead Mountain
|
| region | Anglesey ⓘ |
| timePeriod | Iron Age ⓘ |
| usedAs | defensive settlement ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Caer y Twr hillfort Description of subject: Caer y Twr hillfort is an Iron Age defensive settlement located on the slopes of Holyhead Mountain on Anglesey in Wales.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.