The son of Peter Seddon, dissenting minister successively at Ormskirk and Hereford, he was born at Hereford on 8 December 1725. The Unitarian John Seddon (1719–1769), with whom he has often been confused, is said to have been a second cousin. He was entered at Kendal Academy in 1742, under Caleb Rotheram, and went on to Glasgow University, where he matriculated in 1744, and was a favourite pupil of Francis Hutcheson and William Leechman. On completing his studies he succeeded Charles Owen, D.D., as minister of Cairo Street Chapel, Warrington, Lancashire, where he was ordained on 8 December 1747. Soon after his settlement the Percival family left the established church and attached themselves to Seddon, thought to be a liberal divine of Arian views. Seddon gave private tuition to Thomas Percival.
After the closure of the private academies at Kendal (1753) and Findern, Derbyshire (1754), a project was launched in July 1754 for establishing in the north of England a dissenting academy by subscription. Seddon was one of the most active promoters of the scheme; it was due to him that the final choice fell upon Warrington rather than upon Ormskirk. On 30 June 1757 he was elected secretary, and when the academy opened at Warrington on 20 Oct. he was appointed librarian. As secretary he did not get on well with John Taylor, who had been appointed to the divinity chair; the trustees, however, sided with Seddon against Taylor. Discipline was always a difficulty at Warrington; with a view to better control, in 1767 the office of ‘rector academiæ’ was created, and bestowed upon Seddon. At the same time he succeeded Joseph Priestley in the chair of belles lettres; his manuscript lectures on the philosophy of language and on oratory, in four quarto volumes, were preserved in the library of Manchester College, Oxford.
Taylor's difference with Seddon originated in a controversy respecting forms of prayer. On 3 July 1750 a meeting of dissenting ministers took place at Warrington to consider the introduction of ‘public forms’ into dissenting worship. A subsequent meeting at Preston on 10 September 1751 declared in favour of ‘a proper variety of public devotional offices.’ Next year the ‘provincial assembly’ appointed a committee on the subject; a long controversy followed. On 16 October 1760 a number of persons in Liverpool, headed by Thomas Bentley, agreed to build a chapel for nonconformist liturgical worship, and invited several dissenting ministers to prepare a prayer-book. Taylor declined, and wrote strongly against the scheme. Seddon warmly took it up. On 6 January 1762 he submitted ‘the new liturgy’ to a company of dissenters at the Merchants' coffee-house, Liverpool. This compilation, published 1763, as A Form of Prayer and a New Collection of Psalms, for the use of a congregation of Protestant Dissenters in Liverpool, is often described as Seddon's work; he edited it, but had two coadjutors; of its three services, the third was by Philip Holland; the remaining contributor was Richard Godwin (1722–1787), minister at Gateacre, near Liverpool. The book was used in the Octagon Chapel, Liverpool, from its opening on 5 June 1763 till 25 February 1776, after which the building was sold, and converted into St. Catherine's Church. Seddon declined to become the minister of the Octagon Chapel, and in his own ministry practised extemporary prayer.
Seddon was a main founder (1758) of the Warrington public library, and its first president. He was the first secretary (1764) of the Lancashire and Cheshire Widows' Fund. He died suddenly at Warrington on 23 January 1770, and was buried in Cairo Street Chapel. He married, in 1757, a daughter of one Hoskins, equerry to Frederick, prince of Wales, but had no issue. His wife's fortune was invested in calico-printing works at Stockport, and lost. She survived him. A selection from his letters and papers was edited by Robert Brook Aspland, in the Christian Reformer (1854 pp. 224 sq., 358 sq., 613 sq., 1855 pp. 365 sq.).
Archibald Hamilton Rowan (1 May 1751 – 1 November 1834), christened Archibald Hamilton (sometimes referred to as Archibald Rowan Hamilton), was a founding member of the Dublin Society of United Irishmen. He was the son of Gawen Hamilton (1729–1805) of Killyleagh Castle, County Down and Lady Jane Rowan Hamilton.Philip Holland (minister)
Philip Holland (1721–1789) was an English nonconformist minister.Samuel Vaughan
Samuel Vaughan (1720–1802) was an English merchant, plantation owner, and political radical.Seddon (surname)
Seddon is an English-language surname. Notable people with the surname include:
Bill Seddon (1901–1993), English footballer
Chris Seddon (born 1983), Major League baseball pitcher
Frederick Seddon (1870–1912), British murderer
Gareth Seddon (born 1980), English footballer
George Seddon (academic) (1927–2007), Australian academic
George Seddon (cabinetmaker) (1727–1801), English cabinetmaker
Sir Herbert Seddon (1903–1977), British orthopaedic surgeon and nerve researcher
James Seddon (1815–1880), American lawyer and politician
Jimmy Seddon (1895–1971), English footballer
John Seddon, British occupational psychologist
John Seddon (Unitarian) – English Unitarian minister
John Seddon of Warrington – English dissenter minister
John Pollard Seddon (1827–1906), English Victorian architect
Ken Seddon (1950–2018), English chemist
Margaret Seddon (1872–1968), American film actress
Margaret Rhea Seddon (born 1947), American physician and NASA astronaut
Mark Seddon (born 1962), British journalist
Patsy Seddon, Scottish harpist
Rhea Seddon, retired NASA Astronaut
Richard Seddon (1845–1906), the longest-serving Prime Minister of New Zealand
Robert Seddon (1860–1888), England and British Lion rugby player
Thomas Seddon (1884–1972), New Zealand politician, Richard Seddon's son
Thomas Seddon (1821–1856), English landscape painterFictional characters:
Lewis Seddon, character in British TV series Waterloo RoadWarrington Academy
Warrington Academy, active as a teaching establishment from 1756 to 1782, was a prominent dissenting academy, that is, a school or college set up by those who dissented from the established Church of England. It was located in Warrington (then part of Lancashire, now within Cheshire). Formally dissolved in 1786, the funds then remaining were applied to the founding of Manchester New College in Manchester, which was effectively the Warrington Academy's successor, and in time this led to the formation of Harris Manchester College, Oxford.
A statue of Oliver Cromwell stands in front of the academy.