Adjoining the town is the beautiful park of Lord Dynevor, which contains the ruined keep of Dinefawr Castle and the residence of the Rices (Lords Dynevor), erected early in the 17th century but modernized in 1858.
The historical interest of the place centres in its proximity to the castle of Dinefawr, now commonly called Dynevor, which was originally erected by Rhodri Mawr or his son Cadell about the year 876 on the steep wooded slopes overhanging the Towy.
The castle ruins remain in the possession of the Rices, Lords Dynevor, heirs and descendants of Prince Cadell.
Consolidation of CambroBritish territory was found impossible; there was no settled capital; and the three princes fixed their courts respectively at Aberffraw in Anglesea, at Dynevor (Dinefawr) near Llandilo in Deheubarth, and at Mathrafal in Powys.
Meanwhile the house of Dynevor once more rose to some degree of power under Griffith ap Rhys, whose father, Rhys ap Tudor, had been slain in 1093.
The confused reign of Stephen was naturally favourable to the development of Cymric liberty, and with such strong princes as Owen, son of Griffith ap Cynan, heir to the throne of Gwynedd, and with Griffith ap Rhys ruling at Dynevor, the prospects of the Cymry grew brighter.
This enlightened prince died in 1196, and as at his death the house of Dynevor ceased to be of any further political importance, the overlordship of all Wales became vested indisputably in the house of Gwynedd, which from this point onwards may be considered as representing in itself alone the independent principality of Wales.
For after the battle of Evesham a treaty was concluded between the English king and the Welsh prince at Montgomery, whereby the latter was confirmed in his principality of Gwynedd and was permitted to receive the homage of all the Welsh barons, save that of the head of the house of Dynevor, which the king reserved to himself; whilst the four fertile cantrefs of Perfeddwlad, lying between Gwynedd and the earldom of Chester, were granted to the prince.
Thus Anglesea, Carnarvon, Merioneth and Flint were erected in North Wales; whilst out of the districts of Ystrad Tywi and Ceredigion in South Wales, the old dominions of the house of Dynevor, the counties of Carmarthen and Cardigan were formed.
His son Charles, who filled the office of lord chancellor, was created Baron Talbot of Hensol in Glamorganshire in 1733; and his son William was advanced to the dignity of Earl Talbot in 1761, to which was added Ingestre, the barony of Dynevor, with special remainder to his daughter, Lady Cecil Rice, in 1780.