Question: Who is the Hereditary Keeper of the palace currently under the stewardship of the Marquess of Bute?
Context: Mungo David Malcolm Murray, 7th Earl of Mansfield and Mansfield, 12th Viscount Stormont and Lord Scone, 10th Lord Balvaird and Hereditary Keeper of Lochmaben.  (9 August 1900 – 2 September 1971).  He was styled Lord Scone from 1906 to 1935, was a Scottish Unionist Party politician. Mar's Wark is a ruined building in Stirling built 1570–1572 by John Erskine, Regent of Scotland and Earl of Mar, and now in the care of Historic Scotland.  Mar intended the building for the principal residence of the Erskine family in Stirling, whose chief had become hereditary keeper of the nearby royal Stirling Castle where the princes of Scotland were schooled. ""  is a Scots language word for "work", and here it means "building".  The house is also called "Mar's Lodging." John Crichton-Stuart, 5th Marquess of Bute (4 August 1907 – 14 August 1956) was the son of John Crichton-Stuart, 4th Marquess of Bute and Augusta Bellingham.  On his father's side, the 5th Marquess was a direct male-line descendant of Robert II of Scotland through John Stewart, his illegitimate son by Moira Leitch.  On his mother's side, the 5th Marquess was a descendant of William IV of the United Kingdom through Elizabeth Hay, Countess of Erroll, one of his illegitimate daughters by his mistress, Dorothea Jordan.  As such, the 5th Marquess was the first member of the Bute family to be descended from William IV. Marquess of the County of Bute, shortened in general usage to Marquess of Bute, is a title in the Peerage of Great Britain.  It was created in 1796 for John Stuart, 4th Earl of Bute. Kadriorg Palace (Estonian: "Kadrioru loss" , German: "Schloss Katharinental" ) is a Petrine Baroque palace built for Catherine I of Russia by Peter the Great in Tallinn, Estonia.  Both the Estonian and the German name for the palace means "Catherine's valley".  It was built after the Great Northern War to Nicola Michetti's designs by Gaetano Chiaveri and Mikhail Zemtsov.  The palace currently houses the Kadriorg Art Museum, a branch of the Art Museum of Estonia, displaying foreign art from the 16th to 20th centuries.  The KUMU branch of the museum, showing Estonian art from the 18th century onwards is furthermore situated in the park. Ruadhri is an obscure 13th-century noble, who claimed the Isle of Bute through hereditary descent.  Outlawed by King Alexander III of Scotland, because of attacks against Scottish lands, which he had undertaken as a result of him being denied his declared patrimony to the Isle of Bute through his hereditary right.  When King Hakon IV of Norway began his 1263 expedition against Scotland, Ruadhri presented himself to Hakon and swore fealty to the King of Norway.  He was allowed to participate in the attack on Bute, as part of the campaign, with Rothesay Castle surrendering.  He took revenge on the garrison killing nine upon their retreat.  He was granted the Isle of Bute by King Hakon, however he disappears from contemporary records shortly afterwards. Florence MacMoyer (fl.  1662 – 12 February 1713), a native of Ballymoyer, County Armagh, Ireland was the last hereditary keeper of the Book of Armagh, a 9th-century Irish manuscript written mainly in Latin.  The document is valuable for containing early texts relating to St Patrick and some of the oldest surviving specimens of Old Irish, and for being one of the earliest manuscripts produced by an insular church to contain a near complete copy of the New Testament. Ninian Crichton Stuart (more commonly known as Ninian Stuart) (born 16 March 1957) is the Hereditary Keeper of Falkland Palace, a former Scottish royal palace. Born Patrick Stuart, he was the second son of John Stuart, Lord Mount Stuart, eldest son of John Stuart, 1st Marquess of Bute, son of Prime Minister John Stuart, 3rd Earl of Bute.  His mother was Lady Elizabeth Penelope, daughter and heiress of Patrick McDouall-Crichton, 6th Earl of Dumfries, while John Crichton-Stuart, 2nd Marquess of Bute, was his elder brother.  His father was killed in a riding accident six months before he was born and his mother died when he was three.  In 1817 he was granted the rank of a younger son of a marquess and assumed by Royal licence the surname of Crichton.  The following year he was returned to Parliament for Cardiff, succeeding his uncle Lord Evelyn Stuart, a seat he held until 1820 and again from 1826 to 1832.  Between 1847 and 1859 he also served as Lord-Lieutenant of Buteshire. Falkland Palace in Falkland, Fife, Scotland, is a royal palace of the Scottish Kings.  Today it is under the stewardship of the Marquess of Bute, who delegates most of his duties to The National Trust for Scotland.
Answer: Ninian Crichton Stuart