 Their austere discipline seemed to echo the ideals of the Celtic saints, and the emphasis on pastoral farming fit well into the Welsh stock-rearing economy.In Yorkshire, Rievaulx Abbey was founded from Clairvaux in 1131, on a small, isolated property donated by Walter Espec, with the support of Thurstan, Archbishop of York.By 1143, three hundred monks had entered Rievaulx, including the famous St Ælred.