Owned by the bishops of St. David's the majority of the work done on this monument took place during and soon after the reign of Edward I (late 13th and early 14th centuries).

http://www.castlewales.com/sdbishop.html

Built in 1176 on the site of a 6th century monastery founded by St. David the patron Saint of Wales. He also lends his name to the settlement that grew up around the cathedral. No more than a large village in size it gets city status due to the cathedral (and thus is the smallest city in Britain).

http://www.castlewales.com/stdavid.html

St. Non was said to be St. Davids mother. The ruins are of an Early Medieval chapel, but there is evidence of earlier activity.

http://www.castlewales.com/stnon.html