One of the few members of the surviving ancient Welsh nobility, at the time of his death Williams-Wynn was the closest certain heir of the House of Aberffraw, the former ruling family of Gwynedd and Wales, who were deposed in the English Conquest of 1282. The Williams-Wynn baronets were an important family of Denbighshire landowners, whose 17th-century ancestor had married into the Wynn family of Gwydir, the patrilineal descendants of Owain Gwynedd, Prince of Gwynedd (1137–1170), and in time they became the senior surviving branch of his family. On the death of Sir John Wynn in 1719, his heiress Jane Thelwall inherited both the Wynnstay estate and the Wynn claim to Aberffraw. Her husband Watkin Williams then added the Wynn family name to his own.[3]
In 1904, Williams-Wynn married Elizabeth Ida Lowther, the daughter of G. W. Lowther, and they had two sons, of whom Owen Watkin was heir to the title and estates, and two daughters.[2]
Coat of arms of Sir Watkin Williams-Wynn, 9th Baronet
Crest
An eagle displayed or.
Escutcheon
Quarterly, 1st and 4th, Vert three eagles displayed in fesse or (Wynn), 2nd and 3rd, Argent two foxes counter-salient Gules the dexter surmounted of the sinister (Williams).
Motto
Eryr Eryror Eryri (The eagle of the eagles of Snowdon)
^ abcdef'Sir Watkin Williams-Wynn' (obituary) in The Times (London), issue 52169 dated 27 November 1951, p. 6
^Jacob Youde William Lloyd, The history of the princes, the lords marcher, and the ancient nobility of Powys Fadog, and the ancient lords of Arwystli, Cedewen, and Meirionydd, vol. 6 (T. Richards, 1887), pp. 47–49