sentences:  Saint Patrick, Paul Aurelian, the bard Taliesin, and Magloire, are believed to have spent some time there.Samson of Dol was known to have been summoned by Dyfrig to join the monastery in 521 and he was briefly elected abbot before leaving for Cornwall.Also in the 6th century, Saint Cadfan built the first "Clas" in Wales before establishing a monastery on Bardsey Island.