Eupalinian aqueduct
E672573
The Eupalinian aqueduct is an ancient underground water tunnel on the Greek island of Samos, renowned as a major feat of 6th-century BCE engineering for its precise construction through a mountain.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Eupalinian aqueduct canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T7539438 — 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: Eupalinian aqueduct Context triple: [Pythagoreion archaeological site, locatedNear, Eupalinian aqueduct]
-
A.
Cacor aqueduct
The Cacor aqueduct is a historic French water bridge that carries the Canal de Garonne over the Tarn River near Moissac.
-
B.
Lune Aqueduct
Lune Aqueduct is a historic 18th-century stone aqueduct in Lancaster, England, renowned for carrying the canal high over the River Lune with a series of impressive arches.
-
C.
Espada Aqueduct
Espada Aqueduct is a historic 18th-century stone irrigation structure in San Antonio, Texas, built by Spanish missionaries to supply water to Mission Espada and its surrounding farmlands.
-
D.
Valens Aqueduct
The Valens Aqueduct is a late Roman-era aqueduct in Istanbul, Turkey, that once formed a key part of the city’s water supply system and remains a prominent historic landmark.
-
E.
Agen aqueduct
The Agen aqueduct is a 19th-century stone canal bridge in southwestern France that carries the Canal de Garonne high above the Garonne River near the town of Agen.
- 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: Eupalinian aqueduct Target entity description: The Eupalinian aqueduct is an ancient underground water tunnel on the Greek island of Samos, renowned as a major feat of 6th-century BCE engineering for its precise construction through a mountain.
-
A.
Cacor aqueduct
The Cacor aqueduct is a historic French water bridge that carries the Canal de Garonne over the Tarn River near Moissac.
-
B.
Lune Aqueduct
Lune Aqueduct is a historic 18th-century stone aqueduct in Lancaster, England, renowned for carrying the canal high over the River Lune with a series of impressive arches.
-
C.
Espada Aqueduct
Espada Aqueduct is a historic 18th-century stone irrigation structure in San Antonio, Texas, built by Spanish missionaries to supply water to Mission Espada and its surrounding farmlands.
-
D.
Valens Aqueduct
The Valens Aqueduct is a late Roman-era aqueduct in Istanbul, Turkey, that once formed a key part of the city’s water supply system and remains a prominent historic landmark.
-
E.
Agen aqueduct
The Agen aqueduct is a 19th-century stone canal bridge in southwestern France that carries the Canal de Garonne high above the Garonne River near the town of Agen.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
ancient water tunnel
ⓘ
aqueduct ⓘ archaeological site ⓘ |
| architect | Eupalinos of Megara ⓘ |
| commissionedBy | Polycrates of Samos ⓘ |
| constructionEnd | circa 530 BCE ⓘ |
| constructionMethod |
dug from both ends
ⓘ
tunnel excavation through limestone ⓘ |
| constructionStart | circa 550 BCE ⓘ |
| country | Greece ⓘ |
| elevationDifference | less than 1 meter between entrances ⓘ |
| era | Archaic Greece ⓘ |
| hasPart |
main tunnel
ⓘ
shafts and access points ⓘ water channel ⓘ |
| heritageDesignation | UNESCO World Heritage Site ⓘ |
| heritageDesignationDate | 1992 ⓘ |
| inception | 6th century BCE ⓘ |
| length | approximately 1036 meters ⓘ |
| locatedIn |
Mount Kastro
ⓘ
Samos ⓘ |
| locatedInTimeZone | Eastern European Time ⓘ |
| locatedNear |
Pythagoreion
ⓘ
linked to:
Pythagoreion archaeological site
|
| locatedOn | Greek island of Samos ⓘ |
| locatedUnder | Mount Kastro on Samos ⓘ |
| materialUsed | local stone ⓘ |
| maximumHeight | about 1.8 meters ⓘ |
| namedAfter | Eupalinos of Megara ⓘ |
| notableFor |
being an early example of underground aqueduct engineering
ⓘ
precise geometric and surveying techniques ⓘ tunnel driven from both ends with accurate meeting point ⓘ |
| openToPublic | true ⓘ |
| partOf |
Pythagoreion and Heraion of Samos
ⓘ
linked to:
Pythagoreion archaeological site
|
| purpose |
to bring fresh water to the ancient city of Samos
ⓘ
water supply ⓘ |
| rediscoveredIn | 19th century ⓘ |
| significance |
important example of ancient Greek civil engineering
ⓘ
major feat of 6th-century BCE engineering ⓘ |
| terminus |
ancient city of Samos (Pythagoreion)
ⓘ
linked to:
Pythagoreion archaeological site
|
| touristAttraction | true ⓘ |
| tunnelLength | approximately 1036 meters ⓘ |
| underground | true ⓘ |
| UNESCOCriteria |
(ii)
ⓘ
(iii) ⓘ (iv) ⓘ |
| UNESCOSiteId | 595 ⓘ |
| usedUntil | late antiquity ⓘ |
| waterSource | spring at the north side of Mount Kastro ⓘ |
| width | about 0.6 meters to 0.9 meters ⓘ |
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: Eupalinian aqueduct Description of subject: The Eupalinian aqueduct is an ancient underground water tunnel on the Greek island of Samos, renowned as a major feat of 6th-century BCE engineering for its precise construction through a mountain.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.