Roger Mortimer, 1st Earl of March
E123730
Roger Mortimer, 1st Earl of March, was a powerful 14th-century English nobleman who led the rebellion against King Edward II and effectively ruled England during the early reign of Edward III before being overthrown and executed.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Roger Mortimer, 1st Earl of March canonical | 8 |
| Roger Mortimer | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1005306 — 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: Roger Mortimer, 1st Earl of March Context triple: [Isabella of France, partner, Roger Mortimer, 1st Earl of March]
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A.
Thomas Beaufort, Duke of Exeter
Thomas Beaufort, Duke of Exeter, was an early 15th-century English nobleman, military commander, and half-uncle of King Henry V who played a prominent role in the Hundred Years’ War and royal government.
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B.
Edmund Crouchback, 1st Earl of Lancaster
Edmund Crouchback, 1st Earl of Lancaster, was a 13th-century English prince and military leader who became a powerful noble through extensive landholdings and royal favor, founding the House of Lancaster.
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C.
Edmund Tudor, Duke of Somerset
Edmund Tudor, Duke of Somerset, was a short-lived English prince of the early Tudor dynasty, known primarily as the younger son of King Henry VII of England and Elizabeth of York.
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D.
Henry of Grosmont
Henry of Grosmont was a prominent 14th-century English nobleman, military commander, and statesman who became one of King Edward III’s most trusted lieutenants during the early phases of the Hundred Years’ War.
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E.
Lionel of Antwerp, 1st Duke of Clarence
Lionel of Antwerp, 1st Duke of Clarence, was a 14th-century English prince and nobleman whose lineage played a key role in the later Wars of the Roses through the Yorkist claim to the throne.
- 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: Roger Mortimer, 1st Earl of March Target entity description: Roger Mortimer, 1st Earl of March, was a powerful 14th-century English nobleman who led the rebellion against King Edward II and effectively ruled England during the early reign of Edward III before being overthrown and executed.
-
A.
Thomas Beaufort, Duke of Exeter
Thomas Beaufort, Duke of Exeter, was an early 15th-century English nobleman, military commander, and half-uncle of King Henry V who played a prominent role in the Hundred Years’ War and royal government.
-
B.
Edmund Crouchback, 1st Earl of Lancaster
Edmund Crouchback, 1st Earl of Lancaster, was a 13th-century English prince and military leader who became a powerful noble through extensive landholdings and royal favor, founding the House of Lancaster.
-
C.
Edmund Tudor, Duke of Somerset
Edmund Tudor, Duke of Somerset, was a short-lived English prince of the early Tudor dynasty, known primarily as the younger son of King Henry VII of England and Elizabeth of York.
-
D.
Henry of Grosmont
Henry of Grosmont was a prominent 14th-century English nobleman, military commander, and statesman who became one of King Edward III’s most trusted lieutenants during the early phases of the Hundred Years’ War.
-
E.
Lionel of Antwerp, 1st Duke of Clarence
Lionel of Antwerp, 1st Duke of Clarence, was a 14th-century English prince and nobleman whose lineage played a key role in the later Wars of the Roses through the Yorkist claim to the throne.
- F. None of above. chosen
Statements (50)
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: Roger Mortimer, 1st Earl of March Description of subject: Roger Mortimer, 1st Earl of March, was a powerful 14th-century English nobleman who led the rebellion against King Edward II and effectively ruled England during the early reign of Edward III before being overthrown and executed.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Edward of Caernarfon
Roger Mortimer, 1st Earl of March
→
fullName
→
Roger Mortimer, 1st Earl of March
self-linksurface differs
ⓘ
this entity surface form:
Roger Mortimer