James Hay, 15th Earl of Erroll

He was born James Boyd at Falkirk on 20 April 1726, the eldest son of William Boyd, 4th Earl of Kilmarnock, and his wife Lady Anne Livingston. She was the only daughter of James Livingston, 5th Earl of Linlithgow, a Jacobite attainted for his role in the 1715 Rising, and Lady Margaret Hay, the second daughter of John Hay, 12th Earl of Erroll.[2]

From 1728 to 1746, Erroll was known by the courtesy title of Lord Boyd, while his father was Earl of Kilmarnock.[2]

During the 1745 Jacobite Rebellion his father sided with the Young Pretender, despite both of his sons, James and William Boyd, then holding commissions under King George II; James Boyd in the British army, his brother in the Royal Navy. Remaining loyal to the Hanoverians, James Boyd fought at the Battle of Culloden on the opposite side to his father.[3] During the rout following the Jacobite defeat, the Earl of Kilmarnock was captured and taken prisoner, dishevelled and bareheaded, and was reportedly recognised by his son James, who placed his own hat on his father's head.[4] This was the last time they were to meet, as Kilmarnock was then transported to London, tried for treason, and executed four months later; forfeiting all his lands and titles, which deprived his son of his inheritance.[1]

In 1751, however, although the Earldom remained forfeit, James Boyd was allowed to inherit the Kilmarnock estates. These included Dean Castle, the former family seat which had been gutted by a fire in 1735. Trying to cover some of his father's debts, which he had also inherited, James Boyd sold the ruined castle to the 13th Earl of Glencairn. From 1751 to 1752, he served as Grand Master of the Grand Lodge of Scotland.[2]

On 15 September 1749, he married Rebecca Lockhart, the daughter of Alexander Lockhart, Lord Covington. Before her death in 1761, they were the parents of one daughter:[2]

• Lady Mary Hay (b. 1754), who married Gen. John Scott of Balcomie in 1770, divorced in 1771.[2]

In 1762, he married Isabella Carr (1747–1808), daughter of Sir William Carr of Etal, Northumberland. Together, they were the parents of twelve children, including:[2]

• Lady Charlotte Hay (1763–1800), who married Rev. William Holwell, Vicar of Menheniot, in 1797.[2]
• Lady Isabella Anne Hay (1765–1793)[2]
• Lady Augusta Hay (1766–1822), who married George Boyle, 4th Earl of Glasgow.[2]
• George Hay, 16th Earl of Erroll (1767–1798), who married Elizabeth Jemima Blake, the sister of Joseph Blake, 1st Baron Wallscourt.[2]
• Lady Harriet Jane Hay (1768–1812)[2]
• Lady Margaret Hay (1769–1832), who married Charles Cameron in 1789.[2]
• Lady Maria Elizabeth Hay (1771–1804), who married Rev. George Moore, Rector of Wrotham, eldest son of Most. Rev. John Moore, Archbishop of Canterbury, in 1795.[2]
• William Hay, 17th Earl of Erroll (1772–1819), who married three times and had eleven children.[2]
• Lady Frances Hay (1773–1806)[2]
• Lady Flaminia Hay (1774–1821), who married Capt. George James in 1809.[2]
• Lady Jemima Hay (1776–1822)[2]
• Hon. James Hay (d. 1797)[2]

Lord Erroll died on 3 July 1778 at Callendar House, aged fifty-two, and was succeeded by his eldest son, George.[6] His widow died 3 November 1808.[2]