John Hay, 4th Marquess of Tweeddale

John Hay, 4th Marquess of Tweeddale, (16959 December 1762) was a Scottish nobleman.

Early life He was the eldest son of Charles Hay, 3rd Marquess of Tweeddale and the former Lady Susan Hamilton, the widow of John Cochrane, 2nd Earl of Dundonald, the second daughter of William Douglas-Hamilton, Duke of Hamilton, and Anne Hamilton, suo jure Duchess of Hamilton (eldest daughter and co-heiress of James Hamilton, 1st Duke of Hamilton).

His paternal grandparents were John Hay, 2nd Marquess of Tweeddale and the former Lady Mary Maitland (a daughter of John Maitland, 1st Duke of Lauderdale and the former Anne Home). His uncle, Lord John Hay, commanded the famous regiment of dragoons, afterwards called the Scots Greys, at the Battle of Ramillies. His paternal aunts were Lady Anne Hay (the third wife of William Ross, 12th Lord Ross) and Lady Jean Hay (wife of John Hamilton-Leslie, 9th Earl of Rothes).

During this period he built or converted a large mansion in Edinburgh between Hyndfords Close and St Marys Wynd: an area noe called Tweedale Court, which had long gardens running down to the Cowgate.

Personal life He married Lady Elizabeth (or Frances) Carteret, daughter of John Carteret, 2nd Earl Granville in 1748, and they had four daughters and two sons. The eldest son died in infancy; the younger, George, became fifth Marquess, and died in 1770 at age 13. The title then devolved on his uncle, George Hay. Frances was described by Horace Walpole and the Earl of Morton as merry, good company, and able to sing French, Greek, and Scotch songs.

Free Gardener Hay was a Free Gardener. He was Initiated in the Dunfermline Lodge of Free Gardeners in 1721 and was immediately made Chancellor (Master) of the Lodge. His interest in the Lodge of Free Gardeners was an abiding one for he was again recorded as being Chancellor of the Lodge in 1742. There is no record of him becoming a Freemason.