Background
He was the eldest son of Francis Hay, 9th Earl of Erroll by his third wife, Lady Elizabeth, daughter of William Douglas, 6th Earl of Morton.
He was the eldest son of Francis Hay, 9th Earl of Erroll by his third wife, Lady Elizabeth, daughter of William Douglas, 6th Earl of Morton.
He succeeded to the earldom after his father"s death in 1631. He also succeeded to the title of Lord High Constable of Scotland, and took part in the Scottish coronation of King Charles I of Holyrood Abbey on 18 June 1633. The earl lived such an extravagant lifestyle that he was forced to sell off the family"s namesake lands in Errol, which had been granted to his forebearers by King William the Lion in the 12th century.
He became a member of the Privy Council on 28 May 1633.