Holyhead Breakwater
E339188
Holyhead Breakwater is a massive 19th-century stone breakwater in Holyhead, Wales, built to protect its harbor and known as one of the longest structures of its kind in the UK.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Holyhead Breakwater canonical | 6 |
| Holyhead Harbour works | 1 |
| Holyhead breakwater | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3231859 — 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: Holyhead Breakwater Context triple: [Holyhead, hasLandmark, Holyhead Breakwater]
-
A.
Plymouth Breakwater
Plymouth Breakwater is a massive early 19th-century stone breakwater in Plymouth Sound, England, built to protect the naval anchorage and harbor from the open sea.
-
B.
Menai Bridge
Menai Bridge is a small town on the Isle of Anglesey in Wales, best known for the historic suspension bridge that connects the island to the mainland across the Menai Strait.
-
C.
Totland Pier
Totland Pier is a historic Victorian-era pleasure pier and seaside attraction located on the western coast of the Isle of Wight in England.
-
D.
Fretherne Bridge
Fretherne Bridge is a road swing bridge spanning the Gloucester and Sharpness Canal in Gloucestershire, England.
-
E.
Newport Transporter Bridge
The Newport Transporter Bridge is an early 20th-century steel transporter bridge spanning the River Usk in Newport, Wales, and is one of the few remaining structures of its kind in the world.
- 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: Holyhead Breakwater Target entity description: Holyhead Breakwater is a massive 19th-century stone breakwater in Holyhead, Wales, built to protect its harbor and known as one of the longest structures of its kind in the UK.
-
A.
Plymouth Breakwater
Plymouth Breakwater is a massive early 19th-century stone breakwater in Plymouth Sound, England, built to protect the naval anchorage and harbor from the open sea.
-
B.
Menai Bridge
Menai Bridge is a small town on the Isle of Anglesey in Wales, best known for the historic suspension bridge that connects the island to the mainland across the Menai Strait.
-
C.
Totland Pier
Totland Pier is a historic Victorian-era pleasure pier and seaside attraction located on the western coast of the Isle of Wight in England.
-
D.
Fretherne Bridge
Fretherne Bridge is a road swing bridge spanning the Gloucester and Sharpness Canal in Gloucestershire, England.
-
E.
Newport Transporter Bridge
The Newport Transporter Bridge is an early 20th-century steel transporter bridge spanning the River Usk in Newport, Wales, and is one of the few remaining structures of its kind in the world.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
breakwater
ⓘ
civil engineering structure ⓘ maritime structure ⓘ |
| architecturalStyle | 19th-century industrial engineering ⓘ |
| constructionStart | 1840s ⓘ |
| country | United Kingdom ⓘ |
| hasPart | lighthouse at the seaward end ⓘ |
| hasUse |
harbour wall
ⓘ
sea defence ⓘ |
| heritageDesignation | Grade II* listed structure ⓘ |
| inception | mid-19th century ⓘ |
| length |
approximately 1.5 miles
ⓘ
approximately 2.4 kilometres ⓘ |
| locatedIn |
Anglesey
ⓘ
Holyhead ⓘ Wales ⓘ |
| locatedInBodyOfWater |
Holyhead harbour
ⓘ
linked to:
Holyhead Harbour
|
| locatedNear |
Holyhead Mountain
ⓘ
Irish Sea ⓘ |
| locatedOn | Holy Island ⓘ |
| materialUsed | stone ⓘ |
| notableFor | being one of the longest breakwaters in the United Kingdom ⓘ |
| operator | port authorities of Holyhead ⓘ |
| partOf | Port of Holyhead ⓘ |
| purpose |
harbour protection
ⓘ
shelter for shipping ⓘ |
| significantPeriod | Victorian era ⓘ |
| touristAttraction | true ⓘ |
| usedFor |
commercial shipping
ⓘ
ferry services shelter ⓘ |
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: Holyhead Breakwater Description of subject: Holyhead Breakwater is a massive 19th-century stone breakwater in Holyhead, Wales, built to protect its harbor and known as one of the longest structures of its kind in the UK.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Holyhead Breakwater
linked to: Holyhead Breakwater