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Baron Henley is a title that has been created twice: first in the Peerage of Great Britain and then in the Peerage of Ireland. The first creation came in 1760 in favour of Sir Robert Henley, Lord Chancellor of Great Britain. In 1764 he was further honoured when he was made Earl of Northington. On the death of his son, the second Earl, both titles became extinct.

However, Lady Elizabeth Henley, youngest daughter of the first Earl and co-heiress of the second Earl, married the prominent diplomat Morton Eden. In 1799 the Henley title was revived when Eden was created Baron Henley, of Chardstock in the County of Dorset, in the Peerage of Ireland. Their son, the second Baron, assumed the surname of Henley in lieu of Eden and notably published a biography of his maternal grandfather. His son, the third Baron, sat as a Liberal Member of Parliament for Northampton. In 1885 the Northington title was also revived when he was created Baron Northington, of Watford in the County of Northampton, in the Peerage of the United Kingdom. This title gave the Barons an automatic seat in the House of Lords.

His younger son, the sixth Baron, resumed the surname of Eden in 1925, the same year he succeeded his half-brother in the titles. As of 2007 the peerages are held by his grandson, the eighth Baron, who succeeded his father in 1977. He is a Conservative politician and served in the Conservative administrations of Margaret Thatcher and John Major. Lord Henley is now one of the ninety elected hereditary peers that remain in the House of Lords after the passing of the House of Lords Act of 1999.

The Barons Henley are members of the prominent Eden family. The first Baron was the fifth son of Sir Robert Eden, 3rd Baronet, of West Auckland, and the younger brother of William Eden, 1st Baron Auckland. Their elder brother Sir Robert Eden, 1st Baronet, of Maryland (second son of the third Baronet of West Auckland), was the great-great-grandfather of Prime Minister Anthony Eden, 1st Earl of Avon, and the great-great-great-grandfather of the Conservative politician John Benedict Eden, Baron Eden of Winton.

• see the Earl of Northington

• Morton Eden, 1st Baron Henley (1752-1830)
• Robert Henley Henley, 2nd Baron Henley (1789-1841)
• Anthony Henley Henley, 3rd Baron Henley (1825-1898)
• Frederick Henley Henley, 4th Baron Henley (1849-1923)
• Anthony Ernest Henley Henley, 5th Baron Henley (1858-1925)
• Francis Robert Eden, 6th Baron Henley (1877-1962)
• Michael Francis Eden, 7th Baron Henley (1914-1977)
• Oliver Michael Robert Eden, 8th Baron Henley (b. 1953)

The Heir Apparent is the present holder's son Hon. John Michael Oliver Eden (b. 1988)

• Earl of Avon
• Baron Auckland
• Eden Baronets

• Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990.
• Leigh Rayment's Peerage Page
• www.thepeerage.com