The Battle of Bryn Glas, (sometimes referred to in English accounts as the Battle of Pilleth - although Bryn Glas translates as green or blue hill) was fought on 22 June 1402, near the towns of Knighton and Presteigne in Powys. It was a great victory for the Welsh rebels under Owain Glyndŵr, and it resulted in the prolongation of the Welsh rebellion and the destabilisation of English politics for several years afterwards.