Deputy Ranger of Richmond Park and worked under Prime Minister John Stuart, 3rd Earl of Bute who, by 1761, had been appointed Ranger by George III. At this time - shortly after he ascended the throne in 1760 - the King was sold the Rangership by his daughter Princess Amelia. King George, having appointed the third Lord Bute as Ranger, continued to keep up an interest in the park and instigated many repairs and improvements with Sir Sidney (and at times his brother Philip) as deputy. When Lord Bute died in 1792 the King took the Rangership back into his own keeping and for a short time areas were given over to farming. Sir Sydney died in 1792, aged 91, having worked alongside the King, managing the park's agricultural and grazing branches. Naval career Educated at Oxford, Medows became a midshipman in the Royal Navy and was promoted to lieutenant on 7 August 1755. He became a commander on 5 April 1757 in Renown, a 20-gun sloop, but on 17 August the same year was promoted to post-captain in the frigate , and was ordered to join the Mediterranean Fleet. He commanded her until April 1761, when Vice-Admiral Saunders appointed him to the 50-gun frigate , replacing Captain Edward Wheeler, who had been killed during the capture of the . Medows continued on Isis, in the Mediterranean, until the end of the war in 1763, and in 1769 retired altogether from the Navy. In 1773, Medows's uncle, Evelyn Pierrepont, 2nd Duke of Kingston-upon-Hull, died and left his estates at Thoresby and elsewhere to his wife Elizabeth, Duchess of Kingston, the former wife of the Earl of Bristol. The duke's nephews challenged the will on the grounds of bigamy, and the proceedings which followed established that the marriage of the Duchess had indeed been bigamous. However, this was found not to affect her inheritance, so she was able to retain the Pierrepont estates until her death, which took place in August 1788. Upon inheriting the estates, Medows adopted the surname of Pierrepont by Royal Licence. A watercolour sketch entitled In Captain Pierrepont's Grounds was made by the Preston-born artist Anthony Devis (1729–1817). Political career His family's political dynasty ensured that Medows was a well connected, if not terribly effective parliamentarian. As a Whig, Medows had been on good terms with Horace Walpole, the son of Prime Minister Sir Robert Walpole. Horace