Mary Kerr (1767-1791) was the daughter of General William John Kerr, 5th Marquess of Lothian, and Elizabeth Fortescue. In 1767 she married Major the Hon. Frederick St John, second son of Frederick St John, 2nd Viscount Bolingbroke and Lady Diana Beauclerk. They had one son and she died the day after his birth, at the age of 23
Also known as:
- Mary Kerr
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