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Europe · The successor kingdoms

Kingdom of Brycheiniog

drawn on the map AD 540–1055, 1066–1084

Brycheiniog (giving modern "Brecon"/"Brecknock") lay in the upper Usk valley of south-east Wales, its centre at Talgarth. Its legendary founder was Brychan, traditionally the son of a 5th-century Irish chieftain and a British princess, giving the dynasty a part-Irish origin.

Shown on the map
AD 540–1055, 1066–1084 (2 periods)
Peak area
5k km²
Region
Europe

Names and origin

Brycheiniog (giving modern "Brecon"/"Brecknock") lay in the upper Usk valley of south-east Wales, its centre at Talgarth. Its legendary founder was Brychan, traditionally the son of a 5th-century Irish chieftain and a British princess, giving the dynasty a part-Irish origin. The early phase may have been only a zone of influence, with a clear kingdom emerging in the 9th century; the line is attested largely through later genealogy and hagiography and should be treated cautiously.

Llangorse and the Normans

Its most remarkable monument is the crannog (artificial island) in Llangorse Lake — the only certain crannog in Wales, showing Irish building influence, built (probably in the 890s) as a royal residence (llys), associated with King Tewdwr ab Elise. The Anglo-Saxon Chronicle records that in 916 Æthelflæd, Lady of the Mercians, sent an army into Wales and stormed the royal llys at Brecenanmere (Llangorse), capturing the wife of King Tewdwr ap Elise and thirty-three other persons (Anglo-Saxon Chronicle s.a. 916, as quoted by National Museum Wales). The kingdom later fell under the influence of Deheubarth, and was conquered by the Norman Bernard de Neufmarché between c. 1088 and 1093/95; in the Battle of Brecon (1093) Bernard defeated and killed Rhys ap Tewdwr of Deheubarth, and the Lordship of Brecon was established.

Common questions

What was the Kingdom of Brycheiniog?
Brycheiniog (giving modern "Brecon"/"Brecknock") lay in the upper Usk valley of south-east Wales, its centre at Talgarth. Its legendary founder was Brychan, traditionally the son of a 5th-century Irish chieftain and a British princess, giving the dynasty a part-Irish origin.
When is the Kingdom of Brycheiniog shown on the map?
The border data draws the Kingdom of Brycheiniog AD 540–1055, 1066–1084, in 2 separate periods. The source samples borders at fixed dates, so a span can begin late or run on past the end.
How large was the Kingdom of Brycheiniog?
At its greatest extent drawn on this map, the Kingdom of Brycheiniog covered about 5,000 km². That is the largest area the border data gives it across the years it is drawn, not necessarily its greatest extent in history.

Sources

This compendium cites its sources once for the whole document rather than per territory. Its bibliography names the English Wikipedia articles for each kingdom as the primary basis, with Encyclopædia Britannica, the World History Encyclopedia, national heritage bodies (Historic Environment Wales and Scotland, the Clwyd-Powys Archaeological Trust), museum sources and the Dictionary of Irish Biography, read against the Anglo-Saxon Chronicle, Bede and the Irish annals with their own biases. The article this entry is anchored on:

This entry was last updated .

This entry was researched and drafted with AI from the sources above, and has not been reviewed by a historian. How entries are made

Text available under CC BY-SA 4.0: reuse it with a credit to The World Through Time and a link to this page. Passages drawing on the Wikipedia articles listed above are also licensed CC BY-SA 4.0 by their contributors.

Border geometry for the map itself comes from Cliopatria v0.12 (Seshat Global History Databank, CC-BY-4.0).

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