Williams-Wynn's family had been powerful in politics for several generations, and Sir Watkin effectively controlled several Parliamentary seats and led a
Tory faction in the
House of Commons, though he was less involved in politics than his father, and tended not to lead his faction decisively. The influence of the family had declined during his long minority. He served as a
Member of Parliament for
Shropshire from 1772 to 1774, and for
Denbighshire from 1774 until his death in 1789 aged 39. He was criticised for poor attendance. He was
Lord Lieutenant of Merionethshire from 1775 to 1789.
Patron of the arts , ca. 1768 Sir Watkin made a
Grand Tour to Europe from June 1768, returning by February the next year for his wedding in April. In Rome
Pompeo Batoni painted him with some companions, and a classical subject,
Bacchus and Ariadne was commissioned later, in 1774. 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. The
Neoclassical grave monument for her is by
Joseph Nollekens, in St Mary's Church,
Ruabon,
Clwyd. Sir Watkin played a significant role in the development of
art in Wales, as an early patron of
landscape painting there, which was to become the largest area of artistic activity in Wales. He brought both
Richard Wilson and
Paul Sandby to his seat at
Wynnstay. Wilson was
commissioned to produce two large landscapes
Dinas Bran from Llangollen and
View near Wynnstay which were displayed at the
Royal Academy Exhibition of 1771. Sandby stayed six weeks in the summer of 1770, giving lessons to the family as well as painting, on his first visit to Wales. The next year Sandby returned and from 21 August to 4 September 1771 he and Sir Watkin toured through the mountains of northern Wales. From the sketches made on the tour Sandby published twelve
aquatint Views in North Wales in 1776, and five of his
Views in Wales in 1777. Matching sets from South Wales came from his tours there with Sir
Joseph Banks, who commissioned the whole series. A more ambitious tour together, to Italy, was planned but cancelled after Sir Watkin's second marriage. 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. ==Personal life==