http://books.google.com/books?id=vqgxAQAAIAAJ&pg=PA137#v=onepage&q=&f=false Pages 137 - 138

JOHN, Eleventh Earl of Rothes.

John, only surviving son of John, tenth Earl of Rothes, by Hannah Howard his wife, born in London, 19th October 1744, succeeded as eleventh Earl of Rothes, on the death of his father, 10th December 1767. He was served as heir of tailzie to John, Earl of Rothes, his father, under the entail executed by Margaret, eighth Countess of Rothes, 1st January 1684; and also as nearest lawful heir of line to his father, in the lands of Brog and others, 6th April 1769.

John, Earl of Rothes, had an ensign’s commission in in the 3d Regiment of Foot guards, commanded by his father, 11th May 1760. He married, 4th April 1768, Jane Maitland, second daughter of Captain Maitland of Soutra, in the county of Haddington, but had no issue.

John, eleventh Earl of Rothes, died at Leslie House, 18th July 1773, aged 29, leaving a widow, who, 29th September 1774, married the Honourable Patrick Maitland of French, seventh son of Charles, sixth Earl of Lauderdale. He was succeeded by his eldest sister, Jane Elizabeth, twelfth Countess of Rothes.