Bryn Celli Ddu
E222610
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Bryn Celli Ddu canonical | 5 |
| Bryn Celli Ddu prehistoric burial chamber | 1 |
| Neolithic passage grave Bryn Celli Ddu | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1975259 — 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: Bryn Celli Ddu Context triple: [Anglesey, hasHistoricSite, Bryn Celli Ddu]
-
A.
Cladh Hallan
Cladh Hallan is a Bronze Age archaeological site on the island of South Uist in Scotland, best known for its unique burials containing deliberately mummified human remains.
-
B.
Pwllmeyric
Pwllmeyric is a small village and suburb on the outskirts of Chepstow in Monmouthshire, Wales.
-
C.
Carreg Cennen Castle
Carreg Cennen Castle is a dramatic medieval hilltop fortress in southwest Wales, renowned for its striking clifftop setting and extensive ruins.
-
D.
Bargoed
Bargoed is a former coal mining town in the Rhymney Valley of south Wales that developed rapidly during the industrial era.
-
E.
Harlech
Harlech is a historic coastal town in northwest Wales, best known for its dramatic medieval castle overlooking Cardigan Bay.
- 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: Bryn Celli Ddu Target entity description: 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.
-
A.
Cladh Hallan
Cladh Hallan is a Bronze Age archaeological site on the island of South Uist in Scotland, best known for its unique burials containing deliberately mummified human remains.
-
B.
Pwllmeyric
Pwllmeyric is a small village and suburb on the outskirts of Chepstow in Monmouthshire, Wales.
-
C.
Carreg Cennen Castle
Carreg Cennen Castle is a dramatic medieval hilltop fortress in southwest Wales, renowned for its striking clifftop setting and extensive ruins.
-
D.
Bargoed
Bargoed is a former coal mining town in the Rhymney Valley of south Wales that developed rapidly during the industrial era.
-
E.
Harlech
Harlech is a historic coastal town in northwest Wales, best known for its dramatic medieval castle overlooking Cardigan Bay.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
Neolithic passage tomb
ⓘ
ceremonial monument ⓘ |
| approximateDate |
around 3000 BCE
ⓘ
late 4th millennium BCE ⓘ |
| architecturalStyle | Neolithic ⓘ |
| category |
Megalithic monument in Wales
ⓘ
Passage grave in Europe ⓘ Prehistoric site in Anglesey ⓘ |
| constructedIn | late Neolithic ⓘ |
| country | Wales ⓘ |
| countryAdminBody | Cadw ⓘ |
| culture | Neolithic Britain ⓘ |
| excavatedBy | W. J. Hemp ⓘ |
| excavationEndDate | 1929 ⓘ |
| excavationStartDate | 1928 ⓘ |
| hasArchaeologicalExcavation | yes ⓘ |
| hasFunction |
astronomical observatory
ⓘ
burial site ⓘ ceremonial site ⓘ ritual monument ⓘ |
| hasNearbyFeature |
Afon Braint
ⓘ
Llanddaniel Fab ⓘ Menai Strait ⓘ |
| hasPart |
bank
ⓘ
burial chamber ⓘ capstone ⓘ carved stone pillar ⓘ earthen mound ⓘ entrance passage ⓘ henge ditch ⓘ inner stone circle ⓘ kerbstones ⓘ outer stone circle ⓘ passage ⓘ standing stone ⓘ stone cairn ⓘ |
| heritageDesignation | Scheduled Monument ⓘ |
| locatedIn |
United Kingdom
ⓘ
northwest Wales ⓘ
linked to:
North Wales
|
| locatedOn |
island of Anglesey
ⓘ
linked to:
Anglesey
|
| location | Anglesey ⓘ |
| managedBy | Cadw ⓘ |
| material |
earth
ⓘ
stone ⓘ |
| nameMeaning | Mound in the Dark Grove ⓘ |
| notableFor |
alignment with summer solstice sunrise
ⓘ
prehistoric burial chamber ⓘ |
| openToPublic | yes ⓘ |
| orientation | aligned to midsummer sunrise ⓘ |
| timePeriod | Neolithic period ⓘ |
| usedUntil | early Bronze Age ⓘ |
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: Bryn Celli Ddu Description of subject: 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.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Bryn Celli Ddu
linked to: Bryn Celli Ddu