The Dowager Duchess ofSutherland had Carbisdale Castle built between 1907 and 1917 following the death of her husband, George Granville William Sutherland-Leveson-Gower, the Third DukeofSutherland.
Lady Mary was the duke's second wife and after he died she became embroiled in a legal dispute over his will with her step son, the fourth DukeofSutherland.
The two Titian paintings form part of the Dukeof Sutherland's Bridgewater Collection - featuring works by Raphael, Rembrandt and Poussin - which has been on loan to the National Galleries of Scotland since 1945.
According to Highland Council's history and culture website Am Baile, the duke was horrified by the living conditions of the people of inland Sutherland and believed the land could not sustain them in the long term.
This was while successfully depriving Sutherland's rivers of numerous salmon, occasionally in the company of the Duke's close friend, Winston Churchill.