Question: Jack Stewart-Clark is the owner of what 15th-century castle?

full_context: Document 1: Shaw Stewart baronets: The Stewart, later Shaw Stewart Baronetcy, of Greenock and Blackhall in the County of Renfrew, is a title in the Baronetage of Nova Scotia. It was created on 27 March 1667 for Archibald Stewart. This family is descended in the direct male line from Sir John Stewart, illegitimate son of Robert III of Scotland, who granted him the estate of Ardgowan in Renfrewshire. The third Baronet married Helen, sister and co-heir of Sir John Houston of that Ilk, 4th Baronet, and his wife Margaret, daughter of Sir John Shaw, of Greenock, 2nd Baronet (see Shaw baronets, of Greenock). The fourth Baronet succeeded to the Greenock estates on the death of his great-uncle Sir John Shaw of Greenock, 3rd and last Baronet, in 1752 and assumed the additional surname of Shaw. He later sat as Member of Parliament for Renfrewshire from 1780 to 1783 and from 1786 to 1796. (see also Barony of Blackhall)
Document 2: Thirlestane Castle: Thirlestane Castle is a castle set in extensive parklands near Lauder in the Borders of Scotland. The site is aptly named Castle Hill, as it stands upon raised ground. However, the raised land is within Lauderdale, the valley of the Leader Water. The land has been in the ownership of the Maitland family since 1587, and Thirlestane served as the seat of the Earls of Lauderdale. The castle was substantially extended in the 1670s by the first and only Duke of Lauderdale. Further additions were made in the 19th century. The castle is now cared for by a charitable trust, and is open to the public.
Document 3: Baron Dunleath: Baron Dunleath, of Ballywalter in the County of Down, is a title in the Peerage of the United Kingdom. It was created in 1892 for the businessman and former Conservative Member of Parliament for Downpatrick, John Mulholland. The Mulholland family were involved in the cotton and linen industry in Ulster in the north of Ireland. The first Baron's son, the second Baron, represented Londonderry North in the House of Commons as a Conservative. His grandson, the fourth Baron, was a member of the Northern Ireland Assembly for the Alliance Party. He was succeeded by his first cousin, the fifth Baron, who had already succeeded his father as second Baronet of Ballyscullion (see below). s of 2014 the titles are held by the fifth Baron's son, the sixth Baron, who succeeded in 1997.
Document 4: Menstrie Castle: Menstrie Castle is a three-storey manor house in the town of Menstrie, Clackmannanshire, near Stirling, central Scotland. From the early 17th century, it was home to Sir William Alexander, 1st Earl of Stirling, who was instrumental in founding the colony of Nova Scotia. It was later owned by the Holburn or Holborne family, who were created Baronets of Menstrie in 1706. The castle was restored in the 20th century, won a Civic Trust award, and now incorporates holiday accommodation, private flats, and a museum and cafe run by the National Trust for Scotland.
Document 5: Dundas Castle: Dundas Castle is a 15th-century castle, with substantial 19th-century additions by William Burn, in the Dalmeny parish of West Lothian, Scotland. The home of the Dundas family since the Middle Ages, it was sold in the late 19th century and is currently the residence of politician and businessman Sir Jack Stewart-Clark.
Document 6: Ardwold: Ardwold was the residence of Sir John Craig Eaton and Lady Eaton of Toronto, Ontario, Canada. Sir John was the youngest son of Timothy Eaton, the founder of the T. Eaton Company Department Store, or Eaton's, and he inherited the business and became its president upon his father's death in 1907. Sir John was one of the wealthiest men in Canada, and in 1909 he commissioned a home to be built on "The Hill", a name used to describe the neighborhood on the Davenport Hill in Toronto where many wealthy families built their homes. Casa Loma, built by Henry Pellatt and the largest private house ever constructed in Canada, was near Ardwold, as were Spadina House, the mansion of James Austin, and Glenedyth, the estate of Samuel Nordheimer.
Document 7: Dunira, Perthshire: Durnira (Scottish Gaelic: Dùn Iar) is an estate of about 350 ha in Perthshire, Scotland, about 3 mi north-west of the town of Comrie and about 25 mi north-west of Stirling. The estate is set against a backdrop of mountains, hills and rich lush lowland. Dunira was the home of Henry Dundas, 1st Viscount Melville, although the house he built was replaced in the 19th century. The replacement house burned down in 1948, although the estate is still active.
Document 8: Baron Astor of Hever: Baron Astor of Hever, of Hever Castle in the County of Kent, is a title in the Peerage of the United Kingdom. It was created in 1956 for the prominent newspaper proprietor and Conservative politician the Hon. John Jacob Astor. He was the fourth child of William Waldorf Astor, 1st Viscount Astor. Lord Astor of Hever was succeeded by his eldest son, the second Baron. He served as Lord Lieutenant of Kent between 1972 and 1982. s of 2013 the title is held by the latter's eldest son, the third Baron, who succeeded in 1984. He is one of the ninety elected hereditary peers who remain in the House of Lords after the passing of the House of Lords Act of 1999, and sits on the Conservative benches. As a descendant of the first Viscount Astor, Lord Astor of Hever is also in remainder to this peerage and its subsidiary title Baron Astor, of Hever Castle in the County of Kent.
Document 9: Jack Stewart-Clark: Sir John "Jack" Stewart-Clark, 3rd Baronet (born 17 September 1929) is a British businessman and former Member of the European Parliament (MEP). He represented the Conservative and Unionist Party in the European Parliament from 1979 until 1999. He is the owner of Dundas Castle in West Lothian, Scotland.
Document 10: Douglas Castle: Douglas Castle was a stronghold of the Douglas family from medieval times to the 20th century. The first castle, erected in the 13th century, was destroyed and replaced several times until the 18th century when a large mansion house was built in its place. This too was demolished in 1938, and today only a single corner tower of the 17th-century castle remains. The castle was the former family seat of the Prime Minister, Sir Alec Douglas-Home. The castle was located around 1 km north-east of the village of Douglas, South Lanarkshire, in south-west Scotland. The remains are protected as a category C listed building.
Document 11: Kelburn Castle: Kelburn Castle is a large house near Fairlie, North Ayrshire, Scotland. It is the seat of the Earl of Glasgow. Originally built in the thirteenth century (the original keep forms the core of the house) it was remodelled in the sixteenth century. In 1700 the first Earl made further extensions to the house in a manner not unlike a French "château" which is virtually how it appears today. In 1977 the house and grounds opened to the public as a country park. It is one of the oldest castles in Scotland and has been continuously inhabited by the same family for longer than any other. The castle is protected as a category A listed building, while the grounds are included in the Inventory of Gardens and Designed Landscapes in Scotland.
Document 12: Malcolm Jack: Sir Malcolm Roy Jack KCB (born 17 December 1946) was the Clerk of the House of Commons of the United Kingdom from 2006 to 2011. He began service with the House of Commons in 1967. He was appointed Principal Clerk in 1991 and served as secretary to the House of Commons Commission from 1995 to 2001. He then served as Clerk of the Journals (2001–03) and Clerk of Legislation (2003–06) before being appointed Clerk of the House of Commons in 2006. While in this office he was the editor of the 24th edition of "" (2011).
Document 13: Balloch Castle: Balloch Castle is an early 19th-century country house situated at the southern tip of Loch Lomond, in West Dunbartonshire, Scotland. Balloch was a property of the Lennox family from the 11th century, and the old castle was built in the 13th century. In the 19th century the estate was purchased by John Buchanan of Ardoch, who demolished the ruins of the old castle and erected the present building. The Tudor Gothic architecture is the work of Robert Lugar. In 1915 Balloch was bought by Glasgow City Corporation, and has been leased by West Dunbartonshire Council since 1975. The estate was designated as a country park in 1980, and since 2002 has been part of Loch Lomond and The Trossachs National Park. Although the house has been periodically used for visitor facilities and council offices, it is now included on the Buildings at Risk Register. Balloch Castle is a category A listed building, and the estate is included on the Inventory of Gardens and Designed Landscapes in Scotland.
Document 14: Cawdor Castle: Cawdor Castle is set amid gardens in the parish of Cawdor in Nairnshire, Scotland. The castle is built around a 15th-century tower house, with substantial additions in later centuries. Originally a property of the Calder family, it passed to the Campbells in the 16th century. It remains in Campbell ownership, and is now home to the Dowager Countess Cawdor, stepmother of Colin Campbell, 7th Earl Cawdor.
Document 15: John Stewart (Northern Ireland politician): John Stewart (born 9 April 1983) is a Northern Irish Unionist politician, businessman, and soldier. Since 2017, he has been an Ulster Unionist Party Member of the Northern Ireland Assembly (MLA) for East Antrim.
ground_truth: Dundas Castle