sentences:  He became renowned as a teacher and preacher, founding or restoring twelve monastic settlements in Wales, Dumnonia, and Brittany.St David's Cathedral stands on the site of "Tyddewi" ("David's house"), the monastery he founded in the Glyn Rhosyn valley of Pembrokeshire.The monks fed and clothed the poor and needy; they cultivated the land and carried out many crafts, including beekeeping, in order to feed themselves and the many pilgrims and travellers who needed lodgings.