The Lordship of Cilvae extends from near the Neath to the Tawe, upon which is posted the castle of Abertawe or Swansea, a structure remarkable for its open parapet with a rampart wall above the arches, the work of Bishop Gower. Swansea was the “caput” of Gower under the Earls of Warwick and the De Braoses, and subsidiary to it were the castles of Oystermouth, still standing, and Lwchwr on the Burry river, called the keys of Gower. Lwchwr is now but a small square tower standing upon a small mound connected with a large Roman camp. Within the peninsula are Penrice, an early castle of that family with a good round keep, and in the same parish, and near the church, a moated mound; Oxwich, a late building of the Mansels, a good example of the transition from the castle to the fortified house; Pennard, a quadrangular castle of the Edwardian type; Weobley and Llanrhidian. At Scurlage and Llandewi were castles, and at Llandimor. Mr. Freeman has remarked that twelve of the sixteen churches of Gower have towers evidently built for defence. The exterior doors, where they occur, are usually insertions. The low country beyond the Burry is protected by Kidwelly, a tolerably perfect early castle built by the De Londres family, and inherited from them by the Chaworths. It stands upon the Gwendreath, and to its north is the strong castle of Carreg-Cennen. But the real defence of Caermarthen is the river Towy, strengthened by the four castles on its banks, Llanstephan, Caermarthen, Dynevor, and Drysllwyn, to which may be added Laugharne, upon an adjacent inlet of the sea, and the tower at Llangattock, which commanded the end of the pass from Brecknock. Near to Llandeilo was Llanymdhyfri, which in 1113 belonged to Richard de Pons. Most of these castles seem to have been established by the De Clares of the Strongbow line, but strong as they were, and usually well defended, they had to bear the brunt of the border war, and were often taken and retaken by and from the Welsh, who at times permanently occupied them.