Mount Pleasant State Prison
E591767
Mount Pleasant State Prison was the original name of the New York maximum-security prison now known as Sing Sing Correctional Facility, one of the most historically notorious prisons in the United States.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mount Pleasant State Prison canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T6429961 — 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: Mount Pleasant State Prison Context triple: [Sing Sing Correctional Facility, formerName, Mount Pleasant State Prison]
-
A.
Valley State Prison
Valley State Prison is a California state correctional facility for men located in the city of Chowchilla.
-
B.
Clinton Correctional Facility
Clinton Correctional Facility is a maximum-security state prison in Dannemora, New York, known for housing high-profile inmates and its long-standing role in the New York prison system.
-
C.
Parnall Correctional Facility
Parnall Correctional Facility is a state-run prison in Michigan that houses adult male inmates and is part of the larger Jackson-area correctional complex.
-
D.
Pleasant Valley State Prison
Pleasant Valley State Prison is a California state correctional facility located near the city of Coalinga in Fresno County.
-
E.
Holman Correctional Facility
Holman Correctional Facility is a maximum-security state prison in Alabama known for housing the state's death row and execution chamber.
- 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: Mount Pleasant State Prison Target entity description: Mount Pleasant State Prison was the original name of the New York maximum-security prison now known as Sing Sing Correctional Facility, one of the most historically notorious prisons in the United States.
-
A.
Valley State Prison
Valley State Prison is a California state correctional facility for men located in the city of Chowchilla.
-
B.
Clinton Correctional Facility
Clinton Correctional Facility is a maximum-security state prison in Dannemora, New York, known for housing high-profile inmates and its long-standing role in the New York prison system.
-
C.
Parnall Correctional Facility
Parnall Correctional Facility is a state-run prison in Michigan that houses adult male inmates and is part of the larger Jackson-area correctional complex.
-
D.
Pleasant Valley State Prison
Pleasant Valley State Prison is a California state correctional facility located near the city of Coalinga in Fresno County.
-
E.
Holman Correctional Facility
Holman Correctional Facility is a maximum-security state prison in Alabama known for housing the state's death row and execution chamber.
- F. None of above. chosen
Statements (25)
| Predicate | Object |
|---|---|
| instanceOf |
correctional facility
ⓘ
state prison ⓘ |
| associatedWithTown | Village of Ossining NERFINISHED ⓘ |
| category |
Defunct prisons in New York State
ⓘ
History of corrections in New York ⓘ Maximum-security prisons in the United States ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| formerNameOf | Sing Sing Correctional Facility NERFINISHED ⓘ |
| governedBy | laws of the State of New York ⓘ |
| hasAlternateDesignation | original Sing Sing prison site ⓘ |
| hasSuccessorFacility | Sing Sing Correctional Facility NERFINISHED ⓘ |
| historicalRelation | early New York State penal system ⓘ |
| historicalStatus | renamed as Sing Sing Correctional Facility ⓘ |
| jurisdiction | State of New York NERFINISHED ⓘ |
| locatedIn |
New York State
NERFINISHED
ⓘ
Ossining, New York NERFINISHED ⓘ Westchester County, New York ⓘ |
| notableFor |
association with one of the most historically notorious prisons in the United States
ⓘ
being the original name of Sing Sing prison ⓘ |
| operatedBy |
New York State
NERFINISHED
ⓘ
New York State prison authorities NERFINISHED ⓘ |
| originalFunction | long-term incarceration of convicted offenders ⓘ |
| partOf | New York State prison system NERFINISHED ⓘ |
| replacedBy | Sing Sing Correctional Facility NERFINISHED ⓘ |
| securityClassification | maximum security ⓘ |
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: Mount Pleasant State Prison Description of subject: Mount Pleasant State Prison was the original name of the New York maximum-security prison now known as Sing Sing Correctional Facility, one of the most historically notorious prisons in the United States.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.