Battle of Acheloos (917)
E374545
The Battle of Acheloos (917) was a major medieval clash in which the Bulgarian forces under Tsar Simeon I decisively defeated the Byzantine army, significantly shifting the balance of power in the Balkans.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Battle of Acheloos (917) canonical | 1 |
| Battle of Anchialos (917) | 1 |
| Battle of Katasyrtai (917) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3629516 — 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: Battle of Acheloos (917) Context triple: [Byzantine–Bulgarian wars, notableBattle, Battle of Acheloos (917)]
-
A.
Battle of Dervenakia
The Battle of Dervenakia was a decisive 1822 engagement of the Greek War of Independence in which Greek revolutionary forces crushed a much larger Ottoman army, securing the Peloponnese.
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B.
Battle of Pelekanon
The Battle of Pelekanon was a 1329 clash between the Byzantine Empire and the rising Ottoman beylik in northwestern Anatolia that marked a decisive step in the Ottoman encirclement of Constantinople.
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C.
Battle of Shelon
The Battle of Shelon was a decisive 1471 conflict in which the Grand Duchy of Moscow defeated the Novgorod Republic, paving the way for Muscovite dominance and the eventual annexation of Novgorod.
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D.
Battle of Tryavna
The Battle of Tryavna was a decisive 1190 military victory of the Second Bulgarian Empire over the Byzantine Empire that significantly strengthened Bulgarian independence and regional power.
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E.
Battle of Syllaeum (677)
The Battle of Syllaeum (677) was a major naval clash in which the Byzantine fleet decisively defeated the Arab navy off the coast of Asia Minor, helping to halt the early Muslim advance in the eastern Mediterranean.
- 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: Battle of Acheloos (917) Target entity description: The Battle of Acheloos (917) was a major medieval clash in which the Bulgarian forces under Tsar Simeon I decisively defeated the Byzantine army, significantly shifting the balance of power in the Balkans.
-
A.
Battle of Dervenakia
The Battle of Dervenakia was a decisive 1822 engagement of the Greek War of Independence in which Greek revolutionary forces crushed a much larger Ottoman army, securing the Peloponnese.
-
B.
Battle of Pelekanon
The Battle of Pelekanon was a 1329 clash between the Byzantine Empire and the rising Ottoman beylik in northwestern Anatolia that marked a decisive step in the Ottoman encirclement of Constantinople.
-
C.
Battle of Shelon
The Battle of Shelon was a decisive 1471 conflict in which the Grand Duchy of Moscow defeated the Novgorod Republic, paving the way for Muscovite dominance and the eventual annexation of Novgorod.
-
D.
Battle of Tryavna
The Battle of Tryavna was a decisive 1190 military victory of the Second Bulgarian Empire over the Byzantine Empire that significantly strengthened Bulgarian independence and regional power.
-
E.
Battle of Syllaeum (677)
The Battle of Syllaeum (677) was a major naval clash in which the Byzantine fleet decisively defeated the Arab navy off the coast of Asia Minor, helping to halt the early Muslim advance in the eastern Mediterranean.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
battle
ⓘ
medieval battle ⓘ |
| aftermath |
Byzantine political instability and military reorganization
ⓘ
continued Bulgarian offensives against Byzantium ⓘ |
| alsoKnownAs |
Battle of Acheloos (917)
ⓘ
surface form:
Battle of Anchialos (917)
|
| approximateBulgarianStrength | tens of thousands of troops ⓘ |
| approximateByzantineStrength | tens of thousands of troops ⓘ |
| belligerent |
Byzantine Empire
ⓘ
First Bulgarian Empire ⓘ |
| combatant |
Bulgarian forces
ⓘ
Byzantine armed forces ⓘ
surface form:
Byzantine forces
|
| commander |
John Bogas
ⓘ
Leo Phokas the Elder ⓘ Simeon I of Bulgaria ⓘ |
| conflictIn |
Byzantine–Bulgarian wars
ⓘ
surface form:
Byzantine–Bulgarian Wars
|
| consequence |
enabled Bulgarian expansion in the Balkans
ⓘ
paved the way for Bulgarian advance toward Constantinople ⓘ shifted balance of power in the Balkans in favor of Bulgaria ⓘ weakened Byzantine military position in the Balkans ⓘ |
| countryAtTime | First Bulgarian Empire ⓘ |
| date | 20 August 917 ⓘ |
| era | Middle Ages ⓘ |
| geopoliticalRegion | Balkans ⓘ |
| historicalPeriod | 10th century ⓘ |
| militaryTheater | land warfare ⓘ |
| notableFor |
decisive tactical victory of Simeon I
ⓘ
one of the largest battles in medieval Balkan history ⓘ |
| opponentLeader |
Constantine VII Porphyrogennetos
ⓘ
surface form:
Byzantine Emperor Constantine VII (nominally)
|
| outcome | heavy Byzantine defeat ⓘ |
| partOf |
Byzantine–Bulgarian wars
ⓘ
surface form:
Bulgarian–Byzantine War of 913–927
|
| place |
near Anchialos
ⓘ
near the Acheloos River ⓘ |
| presentDayLocation | near Pomorie, Bulgaria ⓘ |
| primaryOpponentState |
Middle Byzantine period
ⓘ
surface form:
Byzantine Empire under the Macedonian dynasty
|
| primarySource | accounts by Byzantine chroniclers such as Leo the Deacon and later historians ⓘ |
| regentDuringBattle | Empress Zoe Karbonopsina ⓘ |
| relatedEvent |
Battle of Bulgarophygon (896)
ⓘ
Battle of Acheloos (917) self-linksurface differs ⓘ
surface form:
Battle of Katasyrtai (917)
|
| result | decisive Bulgarian victory ⓘ |
| river | Acheloos River (Achelous) in Thrace ⓘ |
| rulerOfVictoriousSide |
Simeon I of Bulgaria
ⓘ
surface form:
Tsar Simeon I of Bulgaria
|
| significance | key victory in the reign of Simeon I of Bulgaria ⓘ |
| strategicObjective |
Bulgarian assertion of dominance over the Balkans
ⓘ
Byzantine attempt to curb Bulgarian power ⓘ |
| tacticalFeature |
Bulgarian use of ambush and favorable terrain
ⓘ
Byzantine frontal advance along the Black Sea coast ⓘ |
| year | 917 ⓘ |
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: Battle of Acheloos (917) Description of subject: The Battle of Acheloos (917) was a major medieval clash in which the Bulgarian forces under Tsar Simeon I decisively defeated the Byzantine army, significantly shifting the balance of power in the Balkans.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Battle of Anchialos (917)
this entity surface form:
Battle of Katasyrtai (917)