Williams-Wynn was the son of
Sir Robert William Herbert Watkin Williams-Wynn, 9th Baronet,
KCB DSO, who (as his own father had done) employed a
Welsh-speaking nanny to ensure that his son would be able to speak Welsh. He was educated at
Eton and the
Royal Military Academy, Woolwich. One of the few members of the surviving ancient Welsh
nobility, 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. ==Life and career==