Background
Erroll was the son of William Harry Hay, 19th Earl of Erroll, and his wife Eliza Amelia Gore.
Erroll was the son of William Harry Hay, 19th Earl of Erroll, and his wife Eliza Amelia Gore.
He succeeded his father in the earldom in 1891. As Colonel, he was in June 1901 appointed Assistant Adjutant-General. He was later an Honorary Major-General in the British Army and a Lieutenant-Colonel commanding the Royal Horse Guards.
Lord Erroll served in the Conservative administration of Arthur Balfour as a Lord-in-Waiting (government whip in the House of Lords) from 1903 to 1905.
In 1901 he was made a Knight of the Thistle. Lady Erroll died in 1934.