It was founded by Cistercian monks from Strata Florida Abbey, and received its charter from Prince Llywelyn ap Iorwerth.
Fe'i sefydlwyd gan fynachod Sistersaidd o Abaty Ystrad Fflur, a derbyniodd ei siarter gan y Tywysog Llywelyn ap Iorwerth (Llywelyn Fawr).