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The title Earl of Kilmarnock was created in the peerage of Scotland in 1661 for William Boyd, 10th Lord Boyd. That title was also created in the Scottish peerage in 1454 for Robert Boyd, Great Chamberlain of Scotland. Both titles were forfeited in 1746.
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Thomas Boyd, the elder son of Robert Boyd, 1st Lord Boyd—and father of the second one—was created Earl of Arran in 1467, but both titles were forfeit in 1469. Considerable confusion exists over the numbering of the Lord Boyds, the numbering in this article is the same as that used in the Oxford Dictionary of National Biography.
The 4th Earl of Kilmarnock was the father of the 15th Earl of Erroll. The Kilmarnock title was revived in 1831 for the latter's grandson, William George Hay, 18th Earl of Erroll, who was created Baron Kilmarnock in the Peerage of the United Kingdom. Since 1941, this title is a separate peerage.