John, Count of Mortain
E1034227
John, Count of Mortain was the Angevin prince who later became King John of England, notorious for his troubled reign and the sealing of Magna Carta in 1215.
All labels observed (1)
| Label | Occurrences |
|---|---|
| John, Count of Mortain canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T13308964 — 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: John, Count of Mortain Context triple: [Earl of Northumbria, positionHeldBy, John, Count of Mortain]
-
A.
Robert, Count of Mortain
Robert, Count of Mortain was a powerful Norman nobleman, half-brother of William the Conqueror, who played a key role in the Norman Conquest of England and became one of the largest landholders in the country.
-
B.
Ranulf de Blondeville
Ranulf de Blondeville was a powerful Anglo-Norman nobleman and military leader of the late 12th and early 13th centuries, best known as the 6th Earl of Chester and a key supporter of the English crown during the reigns of Richard I and John.
-
C.
Arnulf de Montgomery
Arnulf de Montgomery was an Anglo-Norman nobleman and marcher lord of the late 11th and early 12th centuries, known for his role in the Norman consolidation of power in Wales and the Welsh borderlands.
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D.
Gordon de Blois
Gordon de Blois was the husband of pioneering American modernist architect Natalie de Blois.
-
E.
William Longespée, 3rd Earl of Salisbury
William Longespée, 3rd Earl of Salisbury, was an illegitimate son of King Henry II of England who became a prominent Anglo-Norman nobleman and military leader in the early 13th century.
- 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: John, Count of Mortain Target entity description: John, Count of Mortain was the Angevin prince who later became King John of England, notorious for his troubled reign and the sealing of Magna Carta in 1215.
-
A.
Robert, Count of Mortain
Robert, Count of Mortain was a powerful Norman nobleman, half-brother of William the Conqueror, who played a key role in the Norman Conquest of England and became one of the largest landholders in the country.
-
B.
Ranulf de Blondeville
Ranulf de Blondeville was a powerful Anglo-Norman nobleman and military leader of the late 12th and early 13th centuries, best known as the 6th Earl of Chester and a key supporter of the English crown during the reigns of Richard I and John.
-
C.
Arnulf de Montgomery
Arnulf de Montgomery was an Anglo-Norman nobleman and marcher lord of the late 11th and early 12th centuries, known for his role in the Norman consolidation of power in Wales and the Welsh borderlands.
-
D.
Gordon de Blois
Gordon de Blois was the husband of pioneering American modernist architect Natalie de Blois.
-
E.
William Longespée, 3rd Earl of Salisbury
William Longespée, 3rd Earl of Salisbury, was an illegitimate son of King Henry II of England who became a prominent Anglo-Norman nobleman and military leader in the early 13th century.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Angevin monarch
ⓘ
King of England ⓘ Plantagenet ⓘ human ⓘ medieval ruler ⓘ |
| alsoKnownAs |
John Lackland
NERFINISHED
ⓘ
John Plantagenet NERFINISHED ⓘ King John of England NERFINISHED ⓘ |
| birthDate | 1166-12-24 ⓘ |
| birthPlace | Beaumont Palace, Oxford, Kingdom of England NERFINISHED ⓘ |
| burialPlace | Worcester Cathedral NERFINISHED ⓘ |
| child |
Eleanor of England, Countess of Pembroke
NERFINISHED
ⓘ
Henry III of England NERFINISHED ⓘ Isabella of England, Holy Roman Empress NERFINISHED ⓘ Joan of England, Queen of Scotland NERFINISHED ⓘ Richard, 1st Earl of Cornwall NERFINISHED ⓘ |
| conflict | First Barons' War NERFINISHED ⓘ |
| countryOfCitizenship | Kingdom of England ⓘ |
| dateOfEvent | 1215-06-15 ⓘ |
| deathDate | 1216-10-19 ⓘ |
| deathPlace | Newark Castle, Nottinghamshire, Kingdom of England NERFINISHED ⓘ |
| father | Henry II of England NERFINISHED ⓘ |
| givenName | John NERFINISHED ⓘ |
| languageSpoken |
Anglo-Norman
NERFINISHED
ⓘ
Latin ⓘ |
| lostTerritory |
Angevin possessions in France
NERFINISHED
ⓘ
Duchy of Normandy NERFINISHED ⓘ |
| mother | Eleanor of Aquitaine NERFINISHED ⓘ |
| notableEvent | sealed Magna Carta ⓘ |
| notableFor | troubled reign marked by baronial rebellion ⓘ |
| placeOfEvent | Runnymede, near Windsor, England NERFINISHED ⓘ |
| predecessor | Richard I of England NERFINISHED ⓘ |
| reignEnd | 1216-10-19 ⓘ |
| reignStart | 1199-04-06 ⓘ |
| religion | Roman Catholicism ⓘ |
| royalHouse | House of Plantagenet NERFINISHED ⓘ |
| sibling |
Eleanor of England, Queen of Castile
NERFINISHED
ⓘ
Geoffrey II, Duke of Brittany NERFINISHED ⓘ Henry the Young King NERFINISHED ⓘ Joan of England, Queen of Sicily NERFINISHED ⓘ Matilda of England, Duchess of Saxony NERFINISHED ⓘ Richard I of England NERFINISHED ⓘ |
| spouse |
Isabella of Angoulême
NERFINISHED
ⓘ
Isabella, Countess of Gloucester NERFINISHED ⓘ |
| successor | Henry III of England NERFINISHED ⓘ |
| title |
Count of Mortain
NERFINISHED
ⓘ
Duke of Aquitaine NERFINISHED ⓘ Duke of Normandy NERFINISHED ⓘ King of England ⓘ Lord of Ireland NERFINISHED ⓘ |
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: John, Count of Mortain Description of subject: John, Count of Mortain was the Angevin prince who later became King John of England, notorious for his troubled reign and the sealing of Magna Carta in 1215.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.