Baron Kenlis

Marquess of Headfort
Quarterly: 1st & 4th, Ermine, on a chief gules, a fleur-de-lys between two boar's heads couped and erect or (Taylour); 2nd, Vert, a pegasus courant wings endorsed ermine, a chief or, a crescent for difference (Quin); 3rd, Argent, two bendlets gules, on a chief azure, a lion passant argent
Creation date	29 December 1800
Monarch	George III
First holder	Thomas Taylour, 1st Marquess of Headfort
Present holder	Thomas Taylour, 7th Marquess of Headfort
Heir presumptive	Thomas Taylour, Earl of Bective
Subsidiary titles	Earl of Bective Viscount Headfort Baron Headfort Baron Kenlis
Status	Extant
Former seat(s)	Headfort House
Armorial motto	Consequitur quodcunque petit ("He obtains whatever he seeks")

Marquess of Headfort is a title in the Peerage of Ireland. It was created in 1800 for Thomas Taylour, 2nd Earl of Bective.

The Marquess holds the subsidiary titles of Earl of Bective (1766), Viscount Headfort (1762), Baron Headfort, of Headfort in the County of Meath, (1760), and Baron Kenlis, of Kenlis in the County of Meath (1831), all but the last in the Peerage of Ireland. He is also an Irish baronet. Before the passage of the House of Lords Act 1999, the Marquess sat in the House of Lords as Baron Kenlis in the Peerage of the United Kingdom.

The family descends from Thomas Taylor, who came to Ireland during the 1650s from Sussex in England to oversee on behalf of Parliament the fiscal expenditure of Oliver Cromwell's campaign in Ireland and later undertook the duties of a cartographer assisting with Sir William Petty's project of mapping Ireland, known as the Down Survey.

Taylor's son also Thomas Taylor represented Kells in the Irish House of Commons and in 1704, he was created a Baronet, of Kells in the County of Meath, in the Baronetage of Ireland. His grandson, the third Baronet, also sat for Kells in the Irish House of Commons. In 1760 he was raised to the Peerage of Ireland as Baron Headfort, of Headfort in the County of Meath. Two years later he was created Viscount Headfort, of Headfort, in the County of Meath and in 1766 he was even further honoured when he was made Earl of Bective, of Bective Castle, in the County of Meath. He was succeeded by his eldest son, the second Earl. He was one of the 28 original Irish Representative Peers in the House of Lords. In 1800 he was created Marquess of Headfort in the Peerage of Ireland. His son, the second Marquess, assumed the surname of Taylour in lieu of Taylor. In 1831 he was created Baron Kenlis, of Kenlis in the County of Meath, in the Peerage of the United Kingdom. This gave the Marquesses an automatic seat in the House of Lords. Lord Headfort served as a Government Whip in the Whig administration of Lord Melbourne and was also Lord Lieutenant of Cavan. His son, the third Marquess, represented Westmorland in Parliament as a Conservative and also served as Lord Lieutenant of County Meath. His son from his first marriage, Thomas Taylour, Earl of Bective, also sat as a Conservative Member of Parliament. However, he predeceased his father and on Lord Headfort's death the titles passed to his son from his second marriage, the fourth Marquess. He was a Senator of the Irish Free State. As of 2017^[update], the titles are held by his great-grandson, the seventh Marquess, who succeeded his father in 2005.