Maine State Prison (historic location)
E256037
Maine State Prison (historic location) was a long-standing maximum-security correctional facility in Thomaston, Maine, that operated from the early 19th century until its closure and replacement by a new prison in Warren.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Maine State Prison | 2 |
| Maine State Prison (Warren, Maine) | 2 |
| Maine State Prison (historic location) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2330703 — 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: Maine State Prison (historic location) Context triple: [Thomaston, Maine, hasFormerInstitution, Maine State Prison (historic location)]
-
A.
Maine Department of Corrections
The Maine Department of Corrections is the state agency responsible for overseeing adult and juvenile correctional facilities, probation, and parole services throughout Maine.
-
B.
Massachusetts Correctional Institution – Plymouth
Massachusetts Correctional Institution – Plymouth is a minimum-security state prison and pre-release facility for men located in Plymouth, Massachusetts.
-
C.
Maine State Museum
The Maine State Museum is the official state museum of Maine, showcasing the state's natural history, cultural heritage, and industrial past through extensive exhibits and collections.
-
D.
Massachusetts Correctional Institution – Bridgewater
Massachusetts Correctional Institution – Bridgewater is a medium-security state prison and treatment facility for male offenders located in Bridgewater, near Brockton, Massachusetts.
-
E.
Massachusetts Correctional Institution – Shirley
Massachusetts Correctional Institution – Shirley is a medium- and minimum-security state prison complex for men located in Shirley, Massachusetts.
- 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: Maine State Prison (historic location) Target entity description: Maine State Prison (historic location) was a long-standing maximum-security correctional facility in Thomaston, Maine, that operated from the early 19th century until its closure and replacement by a new prison in Warren.
-
A.
Maine Department of Corrections
The Maine Department of Corrections is the state agency responsible for overseeing adult and juvenile correctional facilities, probation, and parole services throughout Maine.
-
B.
Massachusetts Correctional Institution – Plymouth
Massachusetts Correctional Institution – Plymouth is a minimum-security state prison and pre-release facility for men located in Plymouth, Massachusetts.
-
C.
Maine State Museum
The Maine State Museum is the official state museum of Maine, showcasing the state's natural history, cultural heritage, and industrial past through extensive exhibits and collections.
-
D.
Massachusetts Correctional Institution – Bridgewater
Massachusetts Correctional Institution – Bridgewater is a medium-security state prison and treatment facility for male offenders located in Bridgewater, near Brockton, Massachusetts.
-
E.
Massachusetts Correctional Institution – Shirley
Massachusetts Correctional Institution – Shirley is a medium- and minimum-security state prison complex for men located in Shirley, Massachusetts.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
correctional facility
ⓘ
maximum-security prison ⓘ state prison ⓘ |
| category |
1824 establishments in Maine
ⓘ
2002 disestablishments in Maine ⓘ Buildings and structures in Knox County, Maine ⓘ Defunct prisons in the United States ⓘ |
| city |
Thomaston
ⓘ
linked to:
Thomaston, Maine
|
| closure | 2002 ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| demolished | 2002 ⓘ |
| formerName |
Maine State Prison
ⓘ
linked to:
Maine State Prison (historic location)
|
| function | adult male incarceration ⓘ |
| heritageStatus | site of historical interest in Maine ⓘ |
| inception | 1824 ⓘ |
| locatedIn | Thomaston, Maine ⓘ |
| locatedInAdministrativeTerritorialEntity | Knox County, Maine ⓘ |
| notableFor |
historic prison industry and inmate-made crafts
ⓘ
long-standing role in Maine’s penal system ⓘ |
| opened | 1824 ⓘ |
| operatedBy | Maine Department of Corrections ⓘ |
| ownedBy |
State of Maine
ⓘ
linked to:
Maine
|
| partOf |
Maine state correctional system
ⓘ
linked to:
Maine Department of Corrections
|
| publicPerception | notorious for harsh conditions in earlier decades ⓘ |
| replaced |
Maine State Prison (Warren, Maine)
ⓘ
linked to:
Maine State Prison (historic location)
|
| replacedBy |
Maine State Prison (Warren, Maine)
ⓘ
linked to:
Maine State Prison (historic location)
|
| replacedFacilityAt | Warren, Maine ⓘ |
| securityClassification | maximum security ⓘ |
| state | Maine ⓘ |
| useAfterClosure | site cleared after demolition ⓘ |
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: Maine State Prison (historic location) Description of subject: Maine State Prison (historic location) was a long-standing maximum-security correctional facility in Thomaston, Maine, that operated from the early 19th century until its closure and replacement by a new prison in Warren.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Maine State Prison (historic location)
linked to: Maine State Prison (historic location)
linked to: Maine State Prison (historic location)
linked to: Maine State Prison (historic location)