John Crichton-Stuart, 1st Marquess of Bute

John Stuart, 1st Marquess of Bute PC, FRS (30 June 1744 – 16 November 1814), styled Lord Mount Stuart until 1792 and known as The Earl of Bute between 1792 and 1794, was a British nobleman.

Stuart was the son of John Stuart, 3rd Earl of Bute and the former Mary Wortley Montagu, a granddaughter of the 1st Duke of Kingston-upon-Hull and great-granddaughter of the 1st Earl of Sandwich. He was educated at Winchester and Oxford University, and around 1757 he began to be tutored by the later famous Scottish philosopher Adam Ferguson.

Lord Mount Stuart was Tory Member of Parliament for Bossiney from 1766 to 1776. On 2 November 1775 he announced in the House of Commons his intention to introduce a bill to establish a militia in Scotland, and during the next few months James Boswell assisted in seeking support for the bill in Scotland. In March 1776 the bill was debated, but ultimately failed to pass.

In 1776 Mount Stuart was elevated to the Peerage of Great Britain in his own right as Baron Cardiff, of Cardiff Castle in the County of Glamorgan. Though this title was also used, he continued to be known by his courtesy title of Lord Mount Stuart. (He ranked higher in the order of precedence as the heir to an earldom than he did as a substantive baron.) In 1779 he was sworn of the Privy Council and was sent as an envoy to the court of Turin. He was ambassador to Spain in 1783. He held the sinecure of Auditor of the imprests from 1781 until the abolition of the office in 1785, upon which he was paid £7000 compensation.

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