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St Lythans Burial Chamber
The St Lythans burial chamber (Welsh: siambr gladdu Lythian Sant) is a single stone megalithic dolmen, built around 6,000 BP (before present) as part of a chambered long barrow, during the late Neolithic period, in what is now known as the Vale of Glamorgan, Wales.

St Lythans is around one mile (1.6 km) south of Tinkinswood burial chamber, a more extensive cromlech that it may once have resembled, constructed during the same period.

The site is on pasture land, but pedestrian access is allowed and is free, with roadside parking available for 2–3 cars about 50 yards (46 m) from the site.

The dolmen, which has never been fully excavated, is maintained by Cadw (English: to keep), the Welsh Historic Environment Agency.

Features
This chamber tomb is a dolmen, the most common form of megalithic structure in Europe. It stands at the eastern end of a flat topped, 27 metres (89 ft) long, 11 metres (36 ft) wide earthen mound, forming part of a chambered long barrow. It is one of the Severn-Cotswold type, and consists of a cove of three upright stones (orthostats), supporting a large, flat, capstone. All the stones are mudstone, which, as with those used at Tinkinswood, were probably available locally. The capstone, which slopes downwards from south east to north west (the left side of the entrance towards the back, right), measures four metres (13 ft) long, three metres (10 ft) wide, and 0.7 metres (2.3 ft) thick. The insides of the two facing, rectangular, uprights have been smoothed off and there is a port-hole at the top of the triangular, rear stone, similar to some other dolmens, such as at Trethevy Quoit, in Cornwall. The burial chamber has a minimum internal height of 1.8 metres (5.9 ft) and is in an east/west allignment, with the entrance facing east. As with most cromlechs, it is likely that originally, the burial chamber would have had a forecourt immediately outside the entrance to the chamber and the chamber would have been covered by a mound of earth and smaller stones. This has either been eroded, or removed, over time, leaving only a much lower barrow behind the current structure. However, as the chamber is unusually tall, it is possible that the capstone was never fully covered.

History
Prehistoric origins
From the end of the last ice age (between 10,000 and 12,000 BP), mesolithic hunter-gatherers from Central Europe began to migrate to Great Britain. They would have been able to walk between Continental Europe and Great Britain on dry land, prior to the post glacial rise in sea level, up until between 6,000 and 7,000 BP. As the area was heavily wooded and movement would have been restricted, it is likely that people also came to what was to become known as Wales by boat from the Iberian Peninsula. These neolithic colonists integrated with the indigenous people, gradually changing their lifestyles from a nomadic life of hunting and gathering, to become settled farmers. They cleared the forests to establish pasture and to cultivate the land. They built the long barrow at St Lythans around 6,000 BP, about 1,500 years before either Stonehenge or The Egyptian Great Pyramid of Giza was completed. There are over 150 other cromlechs all over Wales, such as Pentre Ifan in Pembrokeshire (Welsh: Sir Benfro) and Bryn Celli Ddu, on Anglesey (Welsh: Ynys Môn), of the same period.

Purpose
As well as places to house and to honour their dead, these cromlechs may have been communal and ceremonial sites where, according to Dr Francis Pryor, people would meet "to socialise, to meet new partners, to acquire fresh livestock and to exchange ceremonial gifts". The corpses of the dead were probably left exposed, before the bones were moved into the burial chamber.

New cultures
In common with the people living all over Great Britain, over the following centuries the people living around what is now known as St Lythans assimilated new immigrants and exchanged ideas of the Bronze Age and Iron Age Celtic cultures. Together with the approximate areas now known as Brecknockshire, Monmouthshire and the rest of Glamorgan, St Lythans was settled by a Celtic British tribe called the Silures.

Although the Roman occupation left no physical impression on St Lythans, its people embraced the Roman religion of Christianity and dedicated a church to St Bleddian, who had been sent to Britain to stamp out the Pelagian Heresy. The current Church of St Bleddian, in St Lythans, a listed grade II* building,[ known locally as St Lythan's Church, was built about ⅔ mile (about 1 km) to the east of this site and has an ancient yew tree in the churchyard.

Recent local history
The Manor of Worlton, which included St Lythans, was given to Bishop Oudoceous (Welsh: Euddogwy) of Llandaf by King Judhail (Welsh: Ithael) in 640 CE. In the 16th century, the manor was acquired by the Button family, who built the first house about 500 yards (0.46 km) north west of the tumulus. The Manor's name was changed to Dyffryn St Nicholas and the house rebuilt in the 18th century, when the estate was purchased by Thomas Pryce. Commenting on St Lythans in his 'A Topographical Dictionary of The Dominion of Wales', London, 1811, Nicholas Carlisle, says "The Resident Population of this Parish, in 1801, was 72. It is 6m. W. S.W. from Caerdiff (sic)." and notes that "Here is a Druidical Altar." (Note the spelling of Cardiff, which corresponds closely to the current local Cardiff pronuciation.) By 1831 the population had grown by over 50 % ("Lythan's, St. (St. Lythian), a parish in the hundred of Dinas-Powis, county of Glamorgan, South Wales, 6 miles (W. S. W.) from Cardiff, containing 103 inhabitants.") and Dyffryn House was being used as "a school for all the poor children of this parish". By now, the dolmen had been correctly identified: "There is a cromlech on St. Lythan's common." (From 'A Topographical Dictionary of Wales' by Samuel Lewis, 1833). Census records show that St Lythans' population fluctuated between 81 (1881) and 136 (1861) over the rest of the 19th century. In 1939, the Dyffryn Estate was leased to the Glamorgan County Council for 999 years.

Local folklore
St Lythans Burial Chamber is also known as Gwâl y Filiast (English: The Greyhound Bitch's Kennel) — the site had been used as an animal shelter in the early 19th century —and Maes y Felin (English: The Mill Field), apparently from the legend that, each Midsummer's Eve, the capstone spins around three times and all the stones go to the nearby river to bathe. The cromlech stands in a field known as the "Accursed Field", so called due to its supposed infertility. However, Julian Cope (born about 25 miles (40 km) to the north, in Deri, Bargoed) has suggested the name may have derived from "Field O'Koeur".

Analysis of contempory local sites
Few human remains survive from this period, the early Neolithic (c 6400 BP–5300 BP). Although, they are comparatively well preserved in the Black Mountains, Gower and the Vale of Glamorgan, where up to 50 individuals, of all ages, have been interred — men, women and children — in each cromlech. Minor excavation was carried out at St Lythans by William Collings Lukis in 1875. However his notes are regarded as "poorly-recorded". A report noted in 1976 CE that "Human remains and coarse pottery were found in 1875 in the debris thrown out from the interior, which partly fills the hollow of the original forecourt in the E (sic) end of the mound." Some surface finds from the cromlech are held in the National Museum Wales, Cardiff. They are a fine leaf-shaped flint arrowhead, a fragment of polished stone axe and several flight flakes. Conservation work was carried out on the eroded barrow in 1992–3 CE, when soil and turfs were replaced to cover the exposed areas. The St Lythans site has not yet been fully excavated. However, results from excavations of other sites are worth noting:

Parc Cwm long cairn
Musculoskelatal analysis of the human remains found at Parc Cwm long cairn (Welsh: carn hir Parc Cwm), Gower, has shown significant gender lifestyle variation. Male muscular development is greater — possibly from hunting, or herding. In contrast, no such variation was noticeable in the remains found during the excavation from the nearby Tinkinswood burial chamber.

Goldsland Wood
Remains from seven neolithic humans have been excavated from a cave at Goldsland Wood, Wenvoe, near the cromlech at St Lythans, together with pottery and flint blades dating from between 5,000 to 5,600 BP. Although there is no evidence to show that the bones relate to the site, it is thought that the corpses had been placed there until they had decomposed. The skeletons would then have been removed to sites such as the St Lythans Burial Chamber, or the Tinkinswood Burial Chamber. This appears to be the first, and only, site found in Britain, where corpses have been left to rot, prior to placement in communal tombs. Most of the remains recovered were small pieces of jaw, fingers or toes. The Tinkinswood site contained human remains and pottery dating to the early Bronze Age, showing that such sites were used over many generations.

Location
St Lythans (Welsh: Llwyneliddon) is a small rural settlement in the Vale of Glamorgan (Welsh: Bro Morgannwg), midway between the villages of Wenvoe (Welsh: Gwenfô) and St Nicholas (Welsh: Sain Nicolas), about four miles (6.4 km) west, south west of Cardiff (Welsh: Caerdydd). The site lies about 500 yards (460 m) south east of Dyffryn House (Welsh: Ty Dyffryn), the manor house set in Dyffryn Gardens (Welsh: Gerddi Dyffryn), the estate to which the St Lythans burial chamber once belonged.

The area is little changed from the mid 19th century, when Llowe's 'A Topographical Dictionary of Wales' (1849) said: "There is a cromlech on a farm belonging to the Dyfryn (sic) estate; it is near the road-side, about half a mile west of the church, on the approach to Dyfryn (sic) village".

The cromlech stands in a field, Maesyfelin (English: The Mill Field), often shared by a herd of cows, to the south of St Lythans Road. Roadside parking is available, for 2—3 cars, about 50 yards (46 m) from the site, which is maintained by Cadw (English: to keep), the Welsh Historic Environment Agency. Access to the field, which slopes gently downwards towards the north west, is permitted, and is free, via a kissing gate. There is no wheelchair access, although there is an uninterrupted view of the site from the gate, about 50 yards (46 m) away.