Medieval Music in the Dales
... is England's festival of medieval music, organised and run by Trouvere. It takes place in and around magnificent Bolton Castle in the Yorkshire Dales every September - the next festival is on September 5-8 2019 and marks the 800th anniversary of the death of William Marshal, England's 'greatest knight', with a focus on the music of the twelfth and thirteenth centuries.
Medieval Music in the Dales has its own site with loads more information...