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The Preston Baronetcy, of Valleyfield in the County of Perth, was created in the Baronetage of Nova Scotia on 13 March 1637 for George Preston.
In 1831 he was created Baron Dunmore, of Dunmore in the Forest of Athole in the County of Perth, in the Peerage of the United Kingdom, which gave him and his descendants a permanent seat in the House of Lords.