The Battle of Bryn Derwin was fought in

Eifionydd Eifionydd () is an area in north-west Wales covering the south-eastern part of the Llŷn Peninsula from Porthmadog to just east of Pwllheli. The Afon Erch forms its western border. It now lies in Gwynedd. The commote of Eifionydd formed the no ...

Gwynedd Gwynedd (; ) is a county and preserved county (latter with differing boundaries; includes the Isle of Anglesey) in the north-west of Wales. It shares borders with Powys, Conwy County Borough, Denbighshire, Anglesey over the Menai Strait, and C ...

in June 1255, between

Llywelyn ap Gruffudd Llywelyn ap Gruffudd (c. 1223 – 11 December 1282), sometimes written as Llywelyn ap Gruffydd, also known as Llywelyn the Last ( cy, Llywelyn Ein Llyw Olaf, lit=Llywelyn, Our Last Leader), was the native Prince of Wales ( la, Princeps Wall ...

and his brothers,

Dafydd ap Gruffudd Dafydd ap Gruffydd (11 July 1238 – 3 October 1283) was Prince of Wales from 11 December 1282 until his execution on 3 October 1283 on the orders of King Edward I of England. He was the last native Prince of Wales before the conquest of Wa ...

and

Owain Goch ap Gruffydd Owain ap Gruffudd (also known as ''Owain Goch'' wain the Red (died 1282) was brother to Llywelyn ap Gruffudd and Dafydd ap Gruffudd and, for a brief period in the late 1240s and early 1250s, ruler of part of the Kingdom of Gwynedd (in modern-day n ...

Llywelyn had ruled over a truncated

Kingdom of Gwynedd The Kingdom of Gwynedd (Medieval Latin: ; Middle Welsh: ) was a Welsh kingdom and a Roman Empire successor state that emerged in sub-Roman Britain in the 5th century during the Anglo-Saxon settlement of Britain. Based in northwest Wales, th ...

jointly with Owain since the death of the previous

Prince of Wales Prince of Wales ( cy, Tywysog Cymru, ; la, Princeps Cambriae/Walliae) is a title traditionally given to the heir apparent to the English and later British throne. Prior to the conquest by Edward I in the 13th century, it was used by the rulers ...

Dafydd ap Llywelyn Dafydd ap Llywelyn (''c.'' March 1212 – 25 February 1246) was Prince of Gwynedd from 1240 to 1246. He was the first ruler in Wales to claim the title Prince of Wales. Birth and descent Though birth years of 1208, 1206, and 1215 have ...

, in 1246, but relations between the two men apparently deteriorated in the early 1250s. The battle lasted for no more than an hour, and resulted in a victory for Llywelyn; Dafydd and Owain were both imprisoned. Owain died in prison around 1282, but Dafydd was soon released and went on to play a central role in the royal government of Gwynedd until his defection and subsequent removal to England in the mid-1260s. Subsequent military campaigns by Llywelyn in 1257 and 1260 recovered much lost Welsh territory, and his undisputed leadership within Wales ushered in a period of stability that would last until the mid-1270s.

Sources

* J. B. Smith, ''Llywelyn ap Gruffudd: Prince of Wales'' (Cardiff, 1998). {{Authority control Bryn Derwin History of Gwynedd Bryn Derwin 1255 in Wales

See also

Sources