Fairfax Stone
E4417
Fairfax Stone is a historic boundary marker in West Virginia that denotes the traditional source of the North Branch of the Potomac River and once defined colonial land grants.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Fairfax Stone canonical | 11 |
| Fairfax Stone monument | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T21315 — 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: Fairfax Stone Context triple: [Potomac River, sourceLocation, Fairfax Stone]
-
A.
Rosslyn
Rosslyn is a major urban business district in Arlington, Virginia, known for its high-rise skyline, corporate offices, and views across the Potomac River to Washington, D.C.
-
B.
Sever Hall
Sever Hall is a historic red-brick academic building at Harvard University, known for its distinctive Romanesque architecture and use as a classroom facility.
-
C.
Sabhal Mòr Ostaig
Sabhal Mòr Ostaig is a renowned Gaelic-medium college on the Isle of Skye in Scotland, dedicated to the preservation and promotion of Scottish Gaelic language and culture.
-
D.
Dunfermline Abbey
Dunfermline Abbey is a historic medieval church and former Benedictine monastery renowned as the burial place of several Scottish kings and queens, including Robert the Bruce.
-
E.
Silver Hill
Silver Hill is a small commuter rail station in Weston, Massachusetts, served by the MBTA's Fitchburg Line.
- 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: Fairfax Stone Target entity description: Fairfax Stone is a historic boundary marker in West Virginia that denotes the traditional source of the North Branch of the Potomac River and once defined colonial land grants.
-
A.
Rosslyn
Rosslyn is a major urban business district in Arlington, Virginia, known for its high-rise skyline, corporate offices, and views across the Potomac River to Washington, D.C.
-
B.
Sever Hall
Sever Hall is a historic red-brick academic building at Harvard University, known for its distinctive Romanesque architecture and use as a classroom facility.
-
C.
Sabhal Mòr Ostaig
Sabhal Mòr Ostaig is a renowned Gaelic-medium college on the Isle of Skye in Scotland, dedicated to the preservation and promotion of Scottish Gaelic language and culture.
-
D.
Dunfermline Abbey
Dunfermline Abbey is a historic medieval church and former Benedictine monastery renowned as the burial place of several Scottish kings and queens, including Robert the Bruce.
-
E.
Silver Hill
Silver Hill is a small commuter rail station in Weston, Massachusetts, served by the MBTA's Fitchburg Line.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
boundary marker
ⓘ
historic site ⓘ landmark ⓘ |
| access | public ⓘ |
| category |
Colonial-era boundary markers in the United States
ⓘ
Historic sites in West Virginia ⓘ Potomac River watershed ⓘ
linked to:
Potomac River
|
| coordinateSystem | boundary between Maryland and West Virginia ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| county | Grant County, West Virginia ⓘ |
| dateOfEstablishment | 1746 ⓘ |
| defines | headwaters of the Potomac River (traditional) ⓘ |
| denotes | traditional source of the North Branch Potomac River ⓘ |
| elevation | approximately 2,700 feet above sea level ⓘ |
| function |
boundary marker
ⓘ
survey reference point ⓘ |
| governingBody | West Virginia Division of Natural Resources ⓘ |
| hasNearbySettlement |
Bayard, West Virginia
ⓘ
Thomas, West Virginia ⓘ |
| heritageDesignation | West Virginia state historic site ⓘ |
| historicalRole |
defined limits of the Northern Neck Proprietary land grant
ⓘ
defined western boundary of colonial Maryland (disputed) ⓘ |
| inception | 1746 ⓘ |
| inscriptionLanguage | English ⓘ |
| locatedIn |
Fairfax Stone Historical Monument State Park
ⓘ
United States ⓘ
linked to:
United States of America
West Virginia ⓘ |
| locatedInProtectedArea | Fairfax Stone Historical Monument State Park ⓘ |
| locatedOnWatercourse | North Branch Potomac River ⓘ |
| markerType | inscribed stone monument ⓘ |
| material | sandstone ⓘ |
| namedAfter | Thomas Fairfax, 6th Lord Fairfax of Cameron ⓘ |
| nearBorder | Maryland–West Virginia state line ⓘ |
| owner |
State of West Virginia
ⓘ
linked to:
West Virginia
|
| partOf | Fairfax Stone Historical Monument State Park ⓘ |
| placedBy | surveyors for Lord Fairfax ⓘ |
| region | Appalachian Mountains ⓘ |
| replacedBy | later boundary survey markers ⓘ |
| riverBasin |
Chesapeake Bay watershed
ⓘ
linked to:
Chesapeake Bay
|
| significance |
early example of colonial boundary surveying in North America
ⓘ
reference point in legal disputes over Maryland–Virginia–West Virginia boundaries ⓘ |
| startPointOf |
Fairfax Line
ⓘ
Maryland–West Virginia boundary (traditional) ⓘ former Maryland–Virginia boundary ⓘ |
| state | West Virginia ⓘ |
| touristAttraction | yes ⓘ |
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: Fairfax Stone Description of subject: Fairfax Stone is a historic boundary marker in West Virginia that denotes the traditional source of the North Branch of the Potomac River and once defined colonial land grants.
Referenced by (13)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Fairfax Stone
linked to: Fairfax Stone