James Innes-Ker, 5th Duke of Roxburghe

James Innes-Ker, 5th Duke of Roxburghe (born James Innes; 10 January 173619 July 1823) was a Scottish nobleman.

Early life He was the eldest surviving son of Sir Henry Innes, 5th Baronet (–1762), and Anne Drummonda Grant (1711–1771). His grandfathers were Sir Harry Innes, 4th Baronet, who represented the Parliament of Scotland constituency of Elginshire from 1704 to 1707, and Sir James Grant, 6th Baronet, a Member of Parliament for Inverness-shire and Elgin Burghs. On the demise of the 3rd Duke, who had never married, his principal titles, and large and productive estates, devolved on William Bellenden-Ker, 4th Duke of Roxburghe, who died shortly thereafter, without heirs. The succession was contested by Major-General Walter Ker and the Right Honorable William Drummond; and only at vast cost decided, on 11 May 1812, in favour of Sir James, as descended from Lady Innes, the third daughter of Hary, Lord Ker, son of the first Earl of Roxburghe.

Lord Bellenden was descended from the second earl; General Ker claimed to be heir male of the first, and Mr. Drummond heir male of the second Earl, so that the issue turned on the construction of an entail, which gave the right to the female line. It is notable that 25 years later, Walter Ker's daughter Essex Ker was involved in litigation against her father's lawyers in connection with bonds issued to cover the costs of the succession litigation.

Personal life James took the name Innes-Ker, and became the 5th Duke of Roxburghe. He married twice, first on 19 April 1769 to Mary Wray (1729/30–1807), the eldest daughter of Sir John Wray, 12th Baronet and sister of Sir Cecil Wray, 13th Baronet.

James Henry Robert Innes-Ker (1816–1879), who married Susanna Stephania Dalbiac, the only child of Sir Charles Dalbiac.

Innes-Ker died on 19 July 1823, and was succeeded in the Dukedom by his only son from his second marriage. Four years after his death, his widow remarried to Lt Col Walter Frederick O'Reilly, CB of the Royal African Corps, on 14 November 1827.

Portraits of the Duke and his second Duchess were painted by Henry Raeburn, and hang in the entrance hall of the family seat of Floors Castle in the Scottish Borders.