Haverfordwesthas the remains of an Augustinian Priory, situated on the edge of the town,close to the banks of the Western Cleddau.

In 1982 excavationsat thePriory revealed a fifteenth century tiled floor.One of the finest examples of a medieval tiled floor in Wales, it suggests that this was a wealthy Priory.

Founded by Robert de Hwlffordd, First Lord of Haverfordwest, mention of the priory is made in a Royal Charter, dated 1331. This confirms the grants made by 'charter to God, St Mary and St Thomas the Martyr of Haverford and the canons serving God there'.

All the feast days were kept by the Black Canonsand Lent was strictly observed. This happy state of affairs was interruptedone day in 1284, when the Archbishop of Canterbury, on his way to St David's, stopped to inspect the Priory.

Archbishop Pecham was greatly disturbed by what he saw in Haverfordwest. The monks appeared to beliving too well. The ' Rule of St Augustine' permitted meat to be eaten on three days a week only, but this wasignored in Haverfordwest.Further more, food remaining after the monks had eaten was meant to be distributed to the poor, not to the monks' relatives or stray dogs.

The Prior was judged to be too fond of leaving the community to entertain guests. In future, this was to occur only if the guest was high ranking. On no account was swearing to be allowed and no lay person was to be given entry without the Prior's permission.

Significantly, perhaps, only high-born ladies were to be allowed to stay the night.

Seventeen graves have been discovered at the site. In the Chapter House, there lies an undated grave; close to it is the effigy of a knight, complete with thirteenth century armour. Thismight be the grave of Robert de Hwlffordd. It is certainly the last resting place of a person of some rank.