Baron Acton

Barony of Acton
Arms of Lyon-Dalberg-Acton
Creation date	11 December 1869
Created by	Queen Victoria
Peerage	Peerage of the United Kingdom
First holder	Sir John Dalberg-Acton, 8th Baronet
Present holder	John Lyon-Dalberg-Acton, 5th Baron Acton
Heir presumptive	Robert Peter Lyon-Dalberg-Acton[1]
Remainder to	the 1st Baron's heirs male of the body lawfully begotten
Subsidiary titles	Baronet Acton of Aldenham, Marquess of Groppoli (in the Grand Duchy of Tuscany)

Baron Acton, of Aldenham in the County of Shropshire, is a title in the Peerage of the United Kingdom.^[2] It was created on 11 December 1869 for Sir John Dalberg-Acton, 8th Baronet, a prominent historian and Liberal Member of Parliament.^[3]

His son, the second Baron, was a diplomat and also held minor office in the Liberal administrations of Sir Henry Campbell-Bannerman and H. H. Asquith. In 1919, he assumed by Royal licence the additional surname of Lyon, which was that of his father-in-law. His son, the third Baron, sold the family home in 1947 and settled in Rhodesia. The fourth Baron, who succeeded his father in 1989, lost his seat in the House of Lords after the passing of the House of Lords Act 1999. However, on 17 April 2000, he was created a life peer as Baron Acton of Bridgnorth, of Aldenham in the County of Shropshire. Consequently, Lord Acton was able to return to the House of Lords, where he sat on the Labour benches. As of 2014, the titles are held by his son, the fifth Baron, who succeeded in 2010.

The Acton Baronetcy, of Aldenham in the County of Shropshire, was created in the Baronetage of England on 17 January 1644 for Edward Acton. He represented Bridgnorth in both the Short Parliament and the Long Parliament, and he was a supporter of Charles I during the Civil War. His son, the second Baronet, grandson, the third Baronet, and great-grandson, the fourth Baronet, all sat as Members of Parliament for Bridgnorth. On the death of the latter's son, the fifth Baronet, the line of the eldest son of the second Baronet failed.

The title was inherited by the fifth Baronet's second cousin once removed, the sixth Baronet. He was the son of Edward Acton, who had settled in Besançon in France as a physician; Edward (of Besançon) was the son of another Edward, son of Walter, second son of Sir Walter Acton (the second Baronet). The sixth Baronet served as Prime Minister of the Kingdom of Naples and married his niece, Mary Anne Acton. He was created Duke of Modica by King Ferdinand III of Sicily but later renounced the title.^[4]A Their second son, Charles Januarius Edward Acton, known as Cardinal Acton, was a prominent clergyman in the Catholic Church.

Upon the sixth Baronet's death in 1811, he was succeeded by his eldest son, the seventh Baronet. In 1832, he married Marie Louise Pelline von Dalberg, only child and heiress of Emmerich Joseph von Dalberg, Duke of Dalberg, a member of an ancient German aristocratic family. The Actons became heirs to the Marquess of Groppoli in Tuscany through the Duke's wife Pellina Brignole-Sale. In 1833, the seventh Baronet assumed by Royal Licence the surname of Dalberg-Acton. He was succeeded by his son, the eighth Baronet, who in 1869 was elevated to the peerage as Baron Acton.

In 1919, the second Baron assumed by Royal Licence the surname of Lyon-Dalberg-Acton. In 2010, upon the death of the fourth Baron, the Acton titles of baronet and baron passed to John Lyon-Dalberg-Acton. As of 31 December 2013, he has not formally proven his succession to the baronetcy and is therefore not on the Official Roll of the Baronetage, with the baronetcy formally considered dormant.^[5]

The family seat was Aldenham Park near Bridgnorth, Shropshire, which was sold in 1959.