Note 54 — Chapter V · OF THE PROGRESS BY THE CASTLE OF USK AND THE TOWN OF CAERLEON
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The Cistercian abbey here alluded to was known by the several names of Ystrat Marchel, Strata Marcella, Alba domus de Stratmargel, Vallis Crucis, or Pola, and was situated between Guilsfield and Welshpool, in Montgomeryshire. Authors differ in opinion about its original founder. Leland attributes it to Owen Cyveilioc, prince of Powys, and Dugdale to Madoc, the son of Gruffydh, giving for his authority the original grants and endowments of this abbey. According to Tanner, about the beginning of the reign of king Edward III., the Welsh monks were removed from hence into English abbeys, and English monks were placed here, and the abbey was made subject to the visitation of the abbot and convent of Buildwas, in Shropshire.