Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. General John Campbell, 4th Duke of Argyll KT PC (c. 1693 9 November 1770) was a Scottish Whig politician in the 17th and 18th centuries. He was born to John Campbell, third son of Archibald Campbell, 9th Earl of Argyll, and Elizabeth Elphinstone, daughter of John Elphinstone, 8th Lord Elphinstone. In 1720 he married Mary Drummond Ker, daughter of John Drummond Ker, 2nd ...