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Earl of Darlington is a title that has been created twice, each time in the Peerage of Great Britain. Baroness von Kielmansegg, half-sister of King George I, was made countess of Darlington in 1722. This creation was for life only, and so the title expired on her death in 1725.[1]
The second creation came in 1754 in favour of Henry Vane, 3rd Baron Barnard, who became the first Earl of Darlington.
In 1827 Lord Darlington was created Marquess of Cleveland and in 1833 Duke of Cleveland.