Formal establishment of this took place 10 September 1121, when Fulchard was installed as the first Abbot by Bishop Bernard of St David's.
However, in 1138, the village and abbey of St Dogmaels were sacked by Gruffudd ap Cynan's sons, Owain Gwynedd and Cadwaladr, acting with princes Anaraud and Cadell with the help of Danish mercenaries.
[4] It is possible that a major building project in 1150–53 was intended to repair damage caused by the attack.
One manuscript, a 13th-century copy of Eusebius's Historia Ecclesiastica, survives and is housed in St John's College, Cambridge.
Large parts of the abbey complex were destroyed or altered by Bradshaw who completed his mansion in 1543.
The square-ended sanctuary was built over a vaulted crypt, possibly a repository for relics of St Dogmael.
In the fourteenth or fifteenth century, much of the west range was altered to provide improved accommodation for the abbot.
The lavish design indicates it may have been an individually distinct chapel, possibly built as a memorial to the founder's family, the lords of Cemais.
[9] Fragments of carved stonework have been collected in the infirmary, and several of the incised stones which were formerly in the parish church have been gathered against the south wall.