Baron Carleton is a title that has been created three times in British history, once in the Peerage of Ireland

Peerage of Ireland

The Peerage of Ireland is the term used for those titles of nobility created by the English and later British monarchs of Ireland in their capacity as Lord or King of Ireland. The creation of such titles came to an end in the 19th century. The ranks of the Irish peerage are Duke, Marquess, Earl,...

 and twice in the Peerage of Great Britain

Peerage of Great Britain

The Peerage of Great Britain comprises all extant peerages created in the Kingdom of Great Britain after the Act of Union 1707 but before the Act of Union 1800...

. The first creation came in the Peerage of England in 1626 when Sir Dudley Carleton

Dudley Carleton, 1st Viscount Dorchester

Dudley Carleton, 1st Viscount Dorchester was an English art collector, diplomat and Secretary of State.-Early life:He was the second son of Antony Carleton of Brightwell Baldwin, Oxfordshire, and of Jocosa, daughter of John Goodwin of Winchendon, Buckinghamshire...

 was made Baron Carleton, of Imbercourt in the County of Surrey. He was made Viscount Dorchester two years later. See the article on him for more information on this creation. Dudley Carleton was the first cousin of Sir John Carleton, 1st Baronet (see Carleton Baronets

Carleton Baronets

The Carleton Baronetcy, of Holcombe in the County of Oxford, was a title in the Baronetage of England. It was created on 28 may 1627 for John Carleton, subsequently Member of Parliament for Cambridgeshire...

).

The second creation came in the Peerage of Great Britain in 1714 when Henry Boyle

Henry Boyle, 1st Baron Carleton

Henry Boyle, 1st Baron Carleton, PC , was an Anglo-Irish politician of the early eighteenth century.-Biography:...

 was made Baron Carleton, of Carleton in the County of York. He was the son of Charles Boyle, 3rd Viscount Dungarvan

Charles Boyle, 3rd Viscount Dungarvan

Charles Boyle, 3rd Viscount Dungarvan, 3rd Baron Clifford, FRS , was a British peer and politician...

 and the brother of Charles Boyle, 2nd Earl of Burlington

Charles Boyle, 2nd Earl of Burlington

Charles Boyle, 3rd Earl of Cork and 2nd Earl of Burlington, 4th Baron Clifford, PC was a peer, courtier and politician....

 (see Earl of Cork

Earl of Cork

Earl of the County of Cork, usually shortened to Earl of Cork, is a title in the Peerage of Ireland. It was created in 1620 for the Anglo-Irish politician Richard Boyle, 1st Baron Boyle...

 for earlier history of the family). The title became extinct upon his death in 1725.

The third creation came in the Peerage of Great Britain in 1786 when Richard Boyle, 2nd Earl of Shannon

Richard Boyle, 2nd Earl of Shannon

Richard Boyle, 2nd Earl of Shannon KP, PC was an Irish peer and Member of Parliament. He represented Dungarvan and Cork County, and then succeeded his father as Earl of Shannon. -Family:...

 was made Baron Carleton, of Carleton in the County of York, which entitled him to a seat in the House of Lords

House of Lords

The House of Lords is the upper house of the Parliament of the United Kingdom. Like the House of Commons, it meets in the Palace of Westminster....

. Lord Shannon was the first cousin of the first holder of the 1714 creation (through his mother Lady Henrietta Boyle, sister of Charles Boyle, 3rd Viscount Dungarvan

Charles Boyle, 3rd Viscount Dungarvan

Charles Boyle, 3rd Viscount Dungarvan, 3rd Baron Clifford, FRS , was a British peer and politician...

), as well as a third cousin on his father's side. The barony and earldom have remained united since. See Earl of Shannon

Earl of Shannon

Earl of Shannon is a title in the Peerage of Ireland. It was created in 1756 for the prominent Irish politician Henry Boyle, who served as Speaker of the Irish House of Commons and as Chancellor of the Irish Exchequer. He was made Viscount Boyle, of Bandon, and Baron Castle Martyr at the same time,...

 for further history of the titles.

Baron Carleton; First creation (1626)

• Dudley Carleton, 1st Baron Carleton
  Dudley Carleton, 1st Viscount Dorchester
  Dudley Carleton, 1st Viscount Dorchester was an English art collector, diplomat and Secretary of State.-Early life:He was the second son of Antony Carleton of Brightwell Baldwin, Oxfordshire, and of Jocosa, daughter of John Goodwin of Winchendon, Buckinghamshire...
  
   (1573–1632) (created Viscount Dorchester in 1628)

Baron Carleton; Third creation (1786)

• Richard Boyle, 2nd Earl of Shannon, 1st Baron Carleton
  Richard Boyle, 2nd Earl of Shannon
  Richard Boyle, 2nd Earl of Shannon KP, PC was an Irish peer and Member of Parliament. He represented Dungarvan and Cork County, and then succeeded his father as Earl of Shannon. -Family:...
  
   (1728–1815) (see Earl of Shannon
  Earl of Shannon
  Earl of Shannon is a title in the Peerage of Ireland. It was created in 1756 for the prominent Irish politician Henry Boyle, who served as Speaker of the Irish House of Commons and as Chancellor of the Irish Exchequer. He was made Viscount Boyle, of Bandon, and Baron Castle Martyr at the same time,...
  
  )