Marquess of Headfort is a title in the Peerage of Ireland, created in 1800 for the Earl of Bective.
The Marquess holds the subsidiary titles of Earl of Bective (1766), Viscount Headfort (1762), Baron Headfort (1760), and Baron Kenlis (1831), all but the last in the Peerage of Ireland. He is also an Irish baronet.
The title of Baron Farnham, of Farnham in the County of Cavan, was created in the Peerage of Ireland in 1756 for John Maxwell, who had previously represented County Cavan in the Irish House of Commons.
His son, the 2nd Baron, was created Viscount Farnham (1760) and Earl of Farnham (1763) in the Peerage of Ireland, but these titles became extinct upon his death in 1779.
His brother and successor, the 3rd Baron, was again created Viscount Farnham (1781) and Earl of Farnham (1785) in the Peerage of Ireland, but these titles again became extinct upon the death of his son, the 2nd Earl of this creation, in 1823.