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Pengwern was a Brythonic settlement of sub-Roman Britain situated in what is now the English county of Shropshire, adjoining the modern Welsh border. It is regarded as possibly being the early seat of the kings of Powys before its establishment at Mathrafal, further west, but the theory that it was an early kingdom (or a sub-kingdom of Powys itself) has also been postulated. Its precise location is uncertain.^[1]

Nothing is known about the foundation of Pengwern, although according to Welsh tradition it was part of the Welsh kingdom of Powys in the early Middle Ages^{[citation needed]}. Early Powys, much larger in extent than the later medieval kingdom, seems to have roughly coincided with the territory of the Celtic Cornovii tribe, whose civitas under Roman rule (capital or administrative centre) was Viroconium Cornoviorum (now Wroxeter)^{[citation needed]}, replacing a fort located on the Wrekin, which was abandoned. Once the Roman legions left the area, Viroconium Cornoviorum had taken control of governing. However, the surrounding pagus (possibly multiple) may have revolted against the rule of Viroconium Cornoviorum, establishing a separate centre of power, which would become Powys. Between 530 and 550, Viroconium Cornoviorum, like many other Roman urban sites and villas in Britain at the time, was abandoned, possibly eventually developing into part of the royal court of Llys Pengwern.^[2]

The exploits of Cynddylan, as imagined around the 9th century, are told in the Old Welsh Canu Heledd (a cycle of poems named after Cynddylan's sister), possibly dating from the 9th century but not recorded until later, and this material situates Cynddylan's seat at Pengwern. These relate to a further cycle of heroic and elegiac poetry concerning early Powys and the Hen Ogledd known as Canu Llywarch Hen.^[3][4][5]

A number of places still identifiable in the Shropshire landscape today are mentioned alongside Pengwern in this poetry. The exact location of Llys Pengwern — the Court of Pengwern — is not known, and the problem is compounded by the fact that several other Pengwerns exist in Wales (e.g. near Denbigh in north Wales). A tradition, recorded by Giraldus Cambrensis in the late 12th century, associates it with the site of modern Shrewsbury (although that town has been known as Amwythig in Welsh since the Middle Ages).^[6]

A more recent suggestion is the Berth, a dramatic hillfort at Baschurch, is the location of Pengwern. However, archaeological evidence shows only the Iron Age fort with possible Roman reuse.^[7] Wroxeter, the former Roman town of Viroconium Cornoviorum, is near these places. Archaeological evidence suggests that the settlement at Wroxeter continued after the Roman withdrawal, and was only finally abandoned in about 520, when it had become indefensible as the last vestiges of Romano-British central government broke down. A fort on the Wrekin, near Wroxeter, has also been suggested for this reason. Another theory is that the earthworks under Whittington Castle may be Pengwern.^[8][9]

Cynddylan apparently joined forces with king Penda of Mercia to protect his realm, possibly also for personal reasons: his brother Gwion had been killed during the Battle of Chester.^[10] (Fellow ally Selyf ap Cynan of Powys died as well, and it is unclear what happened to Powys afterwards, as mentions of their rulers became scarce for nearly a century.) Together Cynddylan and Penda fought against the increasingly powerful Anglian kingdom of Northumbria at the Battle of Maes Cogwy (Oswestry or Forden) in 642. It was here that their mutual enemy, king Oswald, was slain. Regardless, this seems to have bought a period of peace until Penda's death, when a Northumbrian raiding party led by Oswald's brother Oswiu of Northumbria overran northern Mercia and, a bit later, Cynddylan's palace at Llys Pengwern in a surprise attack. Caught completely off guard and without defence, the royal family, including the king, were slaughtered, according to the poetry commemorating the tragedy, with the palace being burned to the ground, likely along with records. Princess Heledd was the only survivor and fled to western Powys.^[11][12] After this the region associated with Pengwern seems to have been shared between Mercia and Powys; part of it remained in Welsh hands until the reign of Offa of Mercia and the construction of his dyke. Part of it consisted of the Anglian sub-kingdom of the Magonsæte and Wreocensæte.^[13]

In Shrewsbury there is the Pengwern Boat Club on the banks of the River Severn, opposite The Quarry park, as well as other shops and businesses that use the name.

• Clancy, Joseph (1970), The Earliest Welsh Poetry
• Remfry, P. M. Whittington Castle and the families of Bleddyn ap Cynfyn, Peverel, Maminot, Powys and Fitz Warin (ISBN 1-899376-80-1)
• Williams, Ifor (1935) Canu Llywarch Hen