Question: The Round Pond is an ornamental lake in front of a palace that has been a residence of the British Royal Family since what century?

Context paragraphs:
Island Creek Pond: Island Creek Pond is a 43 acre pond in Duxbury, Massachusetts in the village of Tinkertown.  The pond is located north of Mill Pond, south of North Hill Marsh Pond, and southwest of Pine Lake and Round Pond.  The pond is the headwaters to Island Creek.  The water quality is impaired due to non-native aquatic plants and non-native fish in the pond.  Crocker Park, an open space area owned by the Town of Duxbury, is situated along the southern shore of the pond.

Kensington Palace: Kensington Palace is a royal residence set in Kensington Gardens, in the Royal Borough of Kensington and Chelsea in London, England.  It has been a residence of the British Royal Family since the 17th century, and is currently the official London residence of the Duke and Duchess of Cambridge, Prince Harry, the Duke and Duchess of Gloucester, the Duke and Duchess of Kent, and Prince and Princess Michael of Kent.

Round Pond (London): The Round Pond is an ornamental lake in Kensington Gardens, London, in front of Kensington Palace.

Pine Lake (Duxbury, Massachusetts): Pine Lake is a 23 acre lake in Duxbury, Massachusetts in the village of Tinkertown.  The lake is located southwest of Round Pond, northwest of Island Creek Pond, and east of Route 3 near the East Street underpass.  The outflow is a small stream that flows into Round Pond.  A small subdivision lies along the southern shore of the lake.

List of British royal residences: This is a list of residences occupied by the British royal family, noting the seasons of the year they are traditionally occupied.  Members of the Royal Family inhabit their range of residences across the United Kingdom.  Some are royal palaces, owned by the Crown and held in trust by the monarch; others are privately owned.  Balmoral Castle and Sandringham House have been inherited as private property for several generations.  Other royal palaces are no longer residences (e.g. the Palace of Westminster, the Palace of Whitehall).  Some remain in irregular use for royal occasions (such as Hillsborough Castle).  The Royal Palaces enjoy certain legal privileges: for example, there is an exemption from levying duty on alcoholic beverages sold in the bars at the Palace of Westminster and there are exemptions from Health and Safety legislation.  According to "Halsbury's Laws of England", it is not possible to arrest a person within the "verges" of a royal palace (though this assertion is contradicted by a memorandum by the Clerk of the House of Commons in respect of the Palace of Westminster), and when a royal palace is used as a residence (regardless of whether the monarch is actually living there at the time), judicial processes cannot be executed within that palace.

List of royal visits to Worthing: Worthing, a seaside town on the West Sussex coast in southeast England, has received many royal visits since Princess Amelia spent five months recovering from an injured knee in 1798.  The patronage of the 15-year-old daughter of King George III helped Worthing develop from a modest village into a high-class resort favoured by wealthy people seeking a quieter alternative to nearby Brighton's fashionable vulgarity.  Other members of the British Royal Family were regular visitors during the first half of the 19th century, when Worthing's prestige was at its highest.  The United Kingdom's current monarch, Queen Elizabeth II, first visited in 1951 when she was still Princess Elizabeth, and regular visits have been made by other members of the British Royal Family since then.  Foreign royal visitors include Haile Selassie I of Ethiopia, who spent several weeks in a seafront hotel as a refugee during his exile.

Allagash Lake: Allagash Lake is in the North Maine Woods on the boundary of Maine range 14 townships 7 and 8.  Allagash Stream flows into the northwest corner of the lake from Allagash Pond, Crescent Pond, and Mud Pond in township 9 range 15.  Allagash Stream overflows the northeast corner of the lake and flows 5 mi through Little Round Pond into Chamberlain Lake.  Chamberlain Lake originally overflowed through Eagle Lake and Churchill Lake to the Allagash River; but was diverted through Telos Cut to the Penobscot River in the 1850s.  Allagash Lake provides good habitat for togue and squaretail.

Princess Alice, Countess of Athlone: Princess Alice, Countess of Athlone, (Alice Mary Victoria Augusta Pauline; née Princess Alice of Albany; 25 February 1883 – 3 January 1981) was a member of the British Royal Family.  She is the longest-lived Princess of the Blood Royal of the British Royal Family, and was the last surviving grandchild of Queen Victoria.  She also held the titles of Princess of Saxe-Coburg and Gotha and Duchess in Saxony from birth, as well as a Princess of Teck by marriage, until 1917 when the British Royal Family ceased usage of German titles.  She was godmother to Queen Beatrix of the Netherlands, who is the granddaughter of her first cousin on her mother's side, Queen Wilhelmina of the Netherlands.

Robert Jobson: Robert Jobson is a newspaper correspondent, broadcaster and author.  He is co-author of "" written with Princess Diana’s police protection officer Inspector Ken Wharfe MVO.  He is also the co-author of "Bulletproof", the life story of Royal Marine and George Cross recipient Matt Croucher GC.  He has written several non-fiction books on royalty, including "The Future Royal Family" (2015).  He has reported on the British Royal Family since 1991 as royal correspondent for UK national newspapers including the "Daily Express", "The Sun" and "London Evening Standard".  He was the recipient of the London Press Club "Scoop of the Year" award for his world exclusive that Prince Charles and Camilla Parker-Bowles were to wed in 2005.  Jobson is Royal Editor for Australia's 7 network top-rated breakfast show Sunrise.  He is also royal commentator for US network ABC News.  He is Royal Consultant for Mark Schwahn's originally scripted series "The Royals" for E! starring British actresses Elizabeth Hurley and Dame Joan Collins and played cameo roles as himself in series 1, 2 and 3.

Caucomgomoc Lake: Caucomgomoc Lake is in the North Maine Woods at the corner of townships 6 and 7 in ranges 14 and 15.  Loon Stream flows into the southern end of the lake from Loon Lake, Bear Pond, Big Hurd Pond, Little Hurd Pond, Bear Brook Pond, McDougal Pond, and tributaries from the southwest.  Overflow from Little Shallow Lake through Shallow Lake, Daggett Pond, and Round Pond enters the east side of Caucomgomoc Lake through Ciss Stream.  Smaller tributaries Avery Brook, Middle Brook, and Ramsell Brook flow into the north end of the lake.  There is a dam at the lake outlet on the eastern shore a short distance south of Ciss Stream.  Discharge through the dam flows down Caucomgomoc Stream through Black Pond and Chesuncook Lake to the West Branch Penobscot River at Ripogenus Gorge.  White perch and yellow perch have largely replaced historic trout populations in the lake.

Supporting paragraphs: Round Pond (London) Kensington Palace
Answer: 17th