Battle of Bryn Glas (22 June 1402)

Location and combatants

The precise site of the encounter is not recorded with certainty. Contemporary and later evidence points to Bryn Glas hill in the vicinity of the parish church of St Mary at Pilleth (in present-day Powys/Radnorshire) as the most probable location, with fighting reported to have taken place on the slopes to the east, west and south of the churchyard. The Welsh force was commanded by Glyndŵr and his captains, while the opposing army was led by Sir Edmund Mortimer on behalf of King Henry IV’s administration in the region.

The battle

Accounts agree that the English attacked the Welsh positions on the hill. The Welsh defenders held the higher ground and were able to repel the assault, with the engagement ending in the collapse of the English formation and the capture of Sir Edmund Mortimer. Contemporary chroniclers emphasised the decisive nature of the defeat rather than exact tactics or numbers; bodies of the dead English were left on the field and later gathered for burial in the churchyard.

Consequences and significance

• Political impact: The capture of Mortimer weakened English authority in the border counties and had important political repercussions. Mortimer later transferred his loyalty to Glyndŵr, a development that bolstered the Welsh cause.
• Military importance: The victory strengthened Glyndŵr’s reputation and encouraged further uprisings and raids against English-held strongpoints.
• Local aftermath: Surviving reports note that the casualties were left on the ground after the battle; the bones were subsequently collected and interred in the nearby churchyard of St Mary.

Legacy and historical notes

The Battle of Bryn Glas remains one of the most frequently cited successes of the Glyndŵr Rising (1400–1415) and is often taught as a turning point in that campaign. The fighting is remembered in local tradition around Pilleth and in wider accounts of Welsh resistance to late medieval English rule. Because documentary evidence is limited and archaeological investigation has been restricted, many details of the engagement — precise troop dispositions, casualty figures and moment-by-moment tactics — remain uncertain, and historians rely on cautious interpretation of the surviving sources.

Where to learn more

For introductions to Glyndŵr’s revolt and to the events of 1402 consult general histories of late medieval Britain and regional studies of the Welsh Marches. Local histories of Pilleth and compilations of medieval chronicles provide further detail on the battle’s aftermath and the burial of the dead in the churchyard of St Mary.