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| Tomen y Mur | |
|---|---|
| Gwynedd,Wales, UK | |
 Reconstructed wall at the northwestern corner of the fort | |
| Location | |
  Tomen y Mur Location inGwynedd | |
| Coordinates | 52°55′48″N3°55′36″W / 52.9299°N 3.9268°W /52.9299; -3.9268 |
| Grid reference | SH705386 |
Tomen y Mur is a First Century ADRoman fort inSnowdonia,Gwynedd, Wales. The fortification, which lies on the slope of an isolated spur northeast ofLlyn Trawsfynydd, was constructed during the North Wales campaigns of governorGnaeus Julius Agricola in AD 78. The fort stood adjacent to theRoman road known asSarn Helen. It was occupied until it was abandoned around AD 140. In the 11th century, theNormans reused part of the site for amotte.
Tomen y Mur, which is managed bySnowdonia National Park Authority, is ascheduled monument.
Tomen y Mur is the Welsh name for the site which means "mound of the wall"; as it is an allusion to Norman Motte that stands within the remains of the Roman embankments, hence cannot be earlier than the 11th century.[1] As no written references about the site have survived, the fort's Roman name is unknown.
According toTacitus, the native Celtic tribe ofOrdovices aggressively resisted Roman occupation of their territory in central and Northwest Wales. Alongside theSilures, they fought a bitterguerrilla war under the leadership ofCaratacus during the AD 50s. Shortly before Agricola's governorship began in AD 78, the Ordovices were still actively resisting and had massacred an entire regiment of RomanCavalry based in their territory. Agricola's response – part of his overall conquest of Wales – was so brutal that Tacitus tells us that the Ordovices were effectively wiped out.[2]
Tomen y Mur was probably built to maintain Roman authority over the area following Agricola's campaigns. Its purpose was to oversee the local populations and protect road communications. The fort, which was first built from raised earthworks and timber, probably housed a cavalry unit of 1000 mounted troops. In the early 2nd century, the fort's personnel was reduced in size and rebuilt in stone to accommodate 500 infantry. The rebuilding work suggests the military situation was stabilising and that legionaries had settled down into a garrison role, so much so that roughly 30 years later the fort was abandoned.
Inscribed stones, found atHarlech Castle and believed to be from Tomen y Mur, document the rebuilding of the fort in stone. Each stone commemorates, in paces, various lengths of completed fortress wall and the units (Centuria) who built them. Some of these Centurial Stones were on display at the now closedSegontium museum,Caernarfon. A section of the 2nd-centurycurtain wall has recently been reconstructed to give an impression of how the defences may once have looked.
The site is important inWelsh mythology; it is the legendary palace ofArdudwy (Mur-y-Castell) in the fourth branch of theMabinogi. Dominating the site today is a Norman eramotte. Little is known about the fortification, but it is possible that it was constructed in 1095 byWilliam Rufus in his attempt to conquer Wales.
The fort's remains are extensive with many ancillary features being traceable as earthworks outside the fort: aparade ground,bath house,mansio (Inn),roads,burial mounds, a possibletemple and a small militaryamphitheatre (Ludus) – a rare feature in Britain.[3] It has been speculated that the arena was built to compensate the legionaries for such a bleak posting, but it is also possible that the fort's very isolation allowed its preservation; many auxiliary forts having had their own arenas erased by ploughing, etc.
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