Ecgfrith of Mercia
E693660
Ecgfrith of Mercia was the short-reigning son and successor of King Offa, briefly ruling the Anglo-Saxon kingdom of Mercia in the late 8th century before his early death ended Offa’s dynastic line.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Ecgfrith of Mercia canonical | 9 |
| Offa’s son Ecgfrith | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7790589 — 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: Ecgfrith of Mercia Context triple: [Offa of Mercia, child, Ecgfrith of Mercia]
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A.
Ecgfrith of Northumbria
Ecgfrith of Northumbria was a 7th-century king of the Anglo-Saxon kingdom of Northumbria, noted for his military campaigns and his death in battle against the Picts.
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B.
Burgred of Mercia
Burgred of Mercia was a 9th-century king of the Anglo-Saxon kingdom of Mercia, known for his struggles against Viking invasions and eventual exile.
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C.
Coenwulf of Mercia
Coenwulf of Mercia was an early 9th-century Anglo-Saxon king who ruled one of the most powerful English kingdoms of his time and played a key role in the politics of the Heptarchy.
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D.
King Ælla of Northumbria
King Ælla of Northumbria was a 9th-century Anglo-Saxon ruler best known for his violent conflict with Viking invaders and his legendary death at their hands, which later became central to Norse saga tradition.
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E.
Eorpwald of East Anglia
Eorpwald of East Anglia was an early 7th-century Anglo-Saxon king noted for his conversion to Christianity and subsequent martyrdom, which marked a key moment in the Christianization of East Anglia.
- 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: Ecgfrith of Mercia Target entity description: Ecgfrith of Mercia was the short-reigning son and successor of King Offa, briefly ruling the Anglo-Saxon kingdom of Mercia in the late 8th century before his early death ended Offa’s dynastic line.
-
A.
Ecgfrith of Northumbria
Ecgfrith of Northumbria was a 7th-century king of the Anglo-Saxon kingdom of Northumbria, noted for his military campaigns and his death in battle against the Picts.
-
B.
Burgred of Mercia
Burgred of Mercia was a 9th-century king of the Anglo-Saxon kingdom of Mercia, known for his struggles against Viking invasions and eventual exile.
-
C.
Coenwulf of Mercia
Coenwulf of Mercia was an early 9th-century Anglo-Saxon king who ruled one of the most powerful English kingdoms of his time and played a key role in the politics of the Heptarchy.
-
D.
King Ælla of Northumbria
King Ælla of Northumbria was a 9th-century Anglo-Saxon ruler best known for his violent conflict with Viking invaders and his legendary death at their hands, which later became central to Norse saga tradition.
-
E.
Eorpwald of East Anglia
Eorpwald of East Anglia was an early 7th-century Anglo-Saxon king noted for his conversion to Christianity and subsequent martyrdom, which marked a key moment in the Christianization of East Anglia.
- F. None of above. chosen
Statements (29)
| Predicate | Object |
|---|---|
| instanceOf |
8th-century English person
ⓘ
Anglo-Saxon monarch ⓘ King of Mercia ⓘ |
| coronationYear | 796 ⓘ |
| country | Mercia ⓘ |
| culture | Anglo-Saxon ⓘ |
| dateOfDeath | 796 ⓘ |
| deathCause | unknown ⓘ |
| dynasty | Mercian royal house ⓘ |
| era | Early Middle Ages ⓘ |
| father | Offa of Mercia ⓘ |
| floruit | late 8th century ⓘ |
| historicalRegion | Anglo-Saxon England ⓘ |
| knownFrom | medieval chronicles ⓘ |
| language | Old English ⓘ |
| monarchOf | Mercia ⓘ |
| notableFor |
being son and successor of Offa of Mercia
ⓘ
his death ending Offa’s direct dynastic line ⓘ short reign as king of Mercia ⓘ |
| parent | Offa of Mercia ⓘ |
| placeOfDeath | Mercia ⓘ |
| positionHeld |
King of Mercia
ⓘ
linked to:
King of the Mercians
|
| predecessor | Offa of Mercia ⓘ |
| reignEnd | 796 ⓘ |
| reignStart | 796 ⓘ |
| relative | Offa of Mercia ⓘ |
| religion | Christianity ⓘ |
| successor | Coenwulf of Mercia ⓘ |
| title | King ⓘ |
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: Ecgfrith of Mercia Description of subject: Ecgfrith of Mercia was the short-reigning son and successor of King Offa, briefly ruling the Anglo-Saxon kingdom of Mercia in the late 8th century before his early death ended Offa’s dynastic line.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Ecgfrith of Mercia