RHYD Y GORS, or Rhyd Cors.--We have no hesitation in adopting the opinion of the late Mr Floyd, that this is another name for the castle of Carmarthen.[938] As it and Pembroke were the only castles which held out during the great Welsh revolt of 1096,[939] it is evident that they were the two strongest and best defended places, therefore the most important. Carmarthen also was a Roman city, and its walls were still standing in Giraldus' time;[940] it was therefore the place where one would expect to find a Norman castle. Now Carmarthen, along with Cardiff and Pembroke, continued up till the final conquest of all Wales to be the most important seat of English power in South Wales. Moreover, Rhyd y Gors was a royal castle; we are expressly told that it was built by William Fitz Baldwin, by the command of the king of England.[941] Carmarthen also was a royal castle, and the only one in South Wales at that date which belonged directly to the king. It was temporarily abandoned after William Fitz Baldwin's death in 1096, and afterwards Henry I. gave it into the custody of a Welshman, who also had charge of Strath Towy; a passage which proves that Rhyd y Gors was in that district. It was restored by Richard Fitz Baldwin in 1104,[942] and is mentioned for the last time in 1105. After that the castle of Carmarthen, which has not been mentioned before, begins to appear, and its importance is clear from the continual references to it. Placed as it is on a navigable river, at the entrance of the narrower part of the vale of Towy, and on the Roman road from Brecon to St David's, its natural position must have marked it as a fit site for a royal castle. The castle is now converted into a gaol, and disfigured in the usual way; yet the ancient motte of William Fitz Baldwin still remains, partly inside and partly outside the walls. It is crowned with a stone revetment which Colonel Morgan believes to have been erected at the time of the Civil War, to form a platform for guns.[943] The bailey is rectangular and covers about 2 acres. The motte is placed at one corner of it, on the line of the walls. On the outside it is now built over with poor cottages; but the site of the ditch can still be traced.