Pre-industrial history Evidence of prehistoric activity in the area is found at Ashton Moss, a
peat bog, and is the only one of Tameside's 22
Mesolithic sites not located in the hilly uplands in the north east of the borough. A single Mesolithic
flint tool was discovered in the bog, alongside a collection of nine
Neolithic flints. There was further activity in or around the bog in the
Bronze Age. In about 1911, an adult male skull was found in the moss; it was thought to belong to the
Romano-British period, similar to the
Lindow Man bog body, until
radiocarbon dating revealed that it dated from 1,320 to 970 BC. The eastern terminus of the early medieval linear earthwork
Nico Ditch is in Ashton Moss (); it was probably used as an administrative boundary and dates from the 8th or 9th century. Legend claims it was built in a single night in 869 or 870 as a defence against Viking invaders. Further evidence of
Dark Age activity in the area comes from the town's name. The "Ashton" part probably derives from the
Anglo-Saxon meaning "settlement by ash trees"; the origin of the "under-Lyne" element is less clear: it could derive from the
British lemo meaning
elm, or refer to Ashton being "under the line" of the
Pennines. This means that Ashton probably became a settlement some time after the
Romans left Britain in the 5th century. An early form of the town's name included the
morpheme "
burh"; this indicates that, in the 11th century, Ashton and
Bury were two of the most important towns in Lancashire. The "under Lyne" suffix was not widely used until the mid-19th century when it became useful for distinguishing the town from other places called Ashton. The
Domesday Survey of 1086 does not directly mention Ashton, perhaps because only a partial survey of the area had been taken.
St Michael's Church, mentioned in the Domesday entry for the
ancient parish of Manchester, might have been in Ashton (also spelt
Asheton,
Asshton and
Assheton). The town itself was first mentioned in the 12th century when the
manor was part of the barony of Manchester. By the late 12th century, a family who adopted the name Assheton held the manor on behalf of the
Gresles, barons of Manchester. Ashton Old Hall was a
manor house, the administrative centre of the manor, and the
seat of the de Ashton or de Assheton family. With three wings, the hall was described by the historians Mike Nevell and John Walker as "one of the finest great houses in the North West" of the 14th century. It has been recognised as important for being one of the few great houses in south-east Lancashire and possibly one of the few halls influenced by French design in the country. The town was granted a
royal charter in 1414, which allowed it to hold a fair twice a year, and a market on every Monday, making the settlement a
market town. According to popular tradition,
Sir Ralph de Assheton, who was
lord of the manor in the mid-14th century and known as the Black Knight, was an unpopular and cruel
feudal lord. After his death, his unpopularity led the locals to parade an effigy of him around the town each Easter Monday and collect money. The effigy would then be hung up, shot, and set on fire, before being torn apart and thrown into the crowd. The first recorded occurrence of the event was in 1795, although the tradition may be older; it continued into the 1830s. The manor remained in the possession of the Assheton family until 1514, when their male line ended. The lordship of the manor passed to
Sir George Booth, great-great-grandson of Sir
Thomas Ashton, On Christmas Day 1826, workers in the town formed the Ashton Unity, a
sickness and benefits society that was later renamed the
Loyal Order of Ancient Shepherds. From 1773 to 1905, 75 cotton mills were established in the town. On his tour of
northern England in 1849, Scottish publisher Angus Reach said: The cotton industry in the area grew rapidly from the start of the 19th century until the
Lancashire Cotton Famine of 1861–1865.The growth of the town's textile industry led to the construction of estates specifically for workers. Workers' housing in
Park Bridge, on the border between Ashton and Oldham, was created in the 1820s. The iron works were founded in 1786 and were some of the earliest in the north west. The Oxford Mills settlement was founded in 1845 by the local industrialist and mill-owner
Hugh Mason who saw it as a model industrial community. A poor supply of fresh water and dwellings without adequate drainage led to a
cholera outbreak in the town in 1832. The Ashton
Poor Law Union was established in 1837 and covered most of what is now Tameside. A new workhouse was built in 1850, providing housing for 500 people; it later became part of
Tameside General Hospital. Construction on the
Sheffield, Ashton-under-Lyne and Manchester Railway (SA&MR) began in 1837 to provide passenger transport between Manchester and
Sheffield. Although a nine-arch
viaduct in Ashton collapsed in April 1845, the line was fully opened on 22 December 1845. The SA&MR was amalgamated with the Sheffield and Lincolnshire Junction Railway, the Great Grimsby & Sheffield Railway, and the Grimsby Docks Company in 1847 to form the
Manchester, Sheffield and Lincolnshire Railway (MS&LR). In 1890, the MS&LR bought the Old Hall and demolished it to make way for the construction of new
sidings. Ashton town centre, which is the largest in Tameside, developed in the Victorian period. Many of the original buildings have survived, and as a result, the town centre is protected by Tameside Council as a conservation area. In the late 19th century, public buildings such as the market hall, town hall, public library, and public baths were built. A donation from Hugh Mason funded the construction of the baths built in 1870–1871. The Ashton-under-Lyne Improvement Act was passed in 1886 which gave the borough influence over housing and allowed the imposition of minimum standards such as drainage. Coal mining was not as important to the town as the textile industry, but in 1882 the Ashton Moss Colliery had the deepest mine shaft in the world at . Ashton's textile industry remained constant between 1865 and the 1920s. Although some mills closed or merged, the number of
spindles in use increased. With the collapse of the overseas market in the 1920s, the town's cotton industry went into decline, and by the 1930s most of the firms and mills in the area had closed.
Modern history At about 4.20 pm on Wednesday 13 June 1917,
a fire in an ammunition factory producing TNT caused an explosion that demolished much of the west end of the town. Two
gasometers exploded and the explosion destroyed the factory and threw heavy objects long distances. At least 41 people died and about 100 were injured. Sylvain Dreyfus, managing director of the works, helped to fight the fire but died in the subsequent explosion. The second of the five victims of the
Moors murders, 12-year-old John Kilbride, lived in the town. He was lured away from the town's market on 23 November 1963 by Ian Brady and Myra Hindley before being murdered and buried on
Saddleworth Moor. His body was found in October 1965. Ashton became a part of the newly formed
Metropolitan Borough of
Tameside in 1974. In 1996, after the success of a similar project in the nearby town of
Hyde, the council pursued the creation of the Ashton Renewal Area in the town, a designation created by the Local Government and Housing Act of 1989. The report on creating the renewal area suggested Ashton had "extremely high levels of unemployment" at 22%, and "some of the worst private sector housing conditions" in Tameside – the Ashton St. Peter's ward was the most deprived in the borough according to the 2000
indices of multiple deprivation. The programme aimed to support people in accessing education, training, and employment opportunities, as well as creating those opportunities through the regeneration of the town itself. Examples of infrastructural improvements listed in the 2005 council report on the project included the Arcades Shopping Centre, the Ladysmith Shopping Centre, Ashton Bus Station and Ashton Market; statistics also suggested a fall in crime; however, critics of the programme noted the lack of attention to the local environment and creation of green spaces as well as more economic opportunities. In July 2014, Deputy Prime Minister
Nick Clegg announced £350 million of investment (£mn in ) into Greater Manchester's transport network ; this included a new interchange in Ashton-under-Lyne to incorporate the then-separate bus and tram stations and to replace the canopy-style waiting areas with a proper building. At the time, the cost of the work was estimated at £32.7mn (£mn in ). In February 2021, the completed interchange opened fully to the public; the interchange features two Metrolink platforms, and fourteen bus stops, of which nine surround the central building. In September 2025, it was announced that a new set of walking links would be added to integrate
Ashton-under-Lyne railway station, which is across the road from the bus and tram station, into the interchange. As well as the regeneration in the 1990s and early 2000s, further regeneration of the town has occurred during the 2020s: in 2024, Mayor
Andy Burnham launched the Ashton Mayoral Development Zone (AMDZ), which is primarily focussed on creating economic opportunities in the local area through the improvement of infrastructure and construction of new business units. The programme makes use of funding from the national
levelling-up policy of the time, and has a greater focus on environmental considerations than the earlier renewal works. The prospectus for the renewal suggests that Ashton's potential for economic growth comes from its connectivity and affordability compared to central Manchester. In August 2025, further details of the regeneration efforts were published by the council, suggesting that it may involve constructing more than 2,000 homes on disused or available land and further areas of commercial opportunities. ==Governance==