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When her father was murdered in 1941, she inherited the earldom of Erroll and the lordship of Hay, while the barony of Kilmarnock had passed to her uncle, Gilbert Boyd, 6th Baron Kilmarnock.
William George Hay, 18th Earl of Erroll KT, GCH, PC (21 February 1801 – 19 April 1846), styled Lord Hay between 1815 and 1819, was a Scottish peer and politician.