He was a baby when his father was killed by a fall from his horse while out hunting, and he inherited the extensive Wynnstay estates, the largest in North Wales.These straddled at least five Welsh counties and extended into Shropshire in England, and yielded an estimated rental income of £20,000 – a very substantial sum at the time, whose spending he tackled with enthusiasm and considerable success.On his coming of age in 1770, he held an extravagant party for 15,000 guests; the bills record consumption of "31 bullocks, 50 hogs, 50 calves, 80 sheep, 18,000 eggs...."[1] An embroidered suit which he may have worn on this occasion is in the possession of the National Museum of Wales.The Rococo silver-gilt toilet service he gave to his first wife, by the London goldsmith Thomas Heming, is now in the National Museum of Wales.[6] He supported the Concerts of Antient Music, and is caricatured by James Gilray in a depiction of King George III of Great Britain attending one he organised.
Sir Watkin Williams-Wynn and, his first wife, Lady Henrietta Somerset, by Sir
Joshua Reynolds
Portrait of Sir Watkin Williams-Wynn and his mother, by
Sir Joshua Reynolds
, ca. 1768