John Crichton-Stuart, 5th Marquess of Bute

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.

On 26 April 1932, he married Lady Eileen Beatrice Forbes (1912–1993) a daughter of Bernard Forbes, 8th Earl of Granard and Beatrice Mills Forbes, an American socialite who was the daughter of Ogden Mills.

They had four children:

The Marquess was an expert ornithologist; in 1931 he bought the islands of St Kilda to preserve them as a bird sanctuary, leaving them to the National Trust for Scotland in 1956.

In 1953, the Marchioness of Bute and Lady St David's Fund was set up to encourage and support women to train as nurses and midwives in south Wales.

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