Clan Rising
Tomen y Mur today

Wales · Partial ruin

Tomen y Mur

Tomen y Mur is a Roman auxiliary fort site on an isolated spur in Gwynedd, Wales, founded in the late 1st century AD and rebuilt in stone in the early 2nd century. The Roman fort's earthworks and a reconstructed section of its 2nd-century curtain wall survive; a later Norman motte stands within the fort's remains. The site is a scheduled monument managed by Snowdonia National Park Authority.

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Photograph via Wikimedia Commons

Its prime

120

Today

Partial ruin

As it stood in 120

What Tomen y Mur looked like in its prime.

A low, roughly rectangular Roman fort of squared stone curtain walls and surviving earthwork banks sits on a grassy spur above rolling pastures; a reconstructed section of 2nd-century curtain wall shows courses of roughly dressed local stone blocks with a slightly raised top. The interior is an open grassy parade area with traces of foundations; the surrounding landscape is open moorland falling away to distant Snowdonia ridges under wide, often cloudy skies.

Its story

The story of Tomen y Mur.

Tomen y Mur began as a Roman auxiliary fort, constructed in AD 78 during the North Wales campaigns of the governor Gnaeus Julius Agricola, on an isolated spur northeast of Llyn Trawsfynydd beside the Roman road known as Sarn Helen. Rebuilt in stone in the early 2nd century, it was occupied until it was abandoned around AD 140.

In the 11th century the Normans reused part of the site for a motte, which still stands within the fort's earthworks alongside a reconstructed section of the 2nd-century curtain wall. The site is a scheduled monument managed by Snowdonia National Park Authority.

Step inside

10 places to explore in 120.

The record describes 10 distinct spots at Tomen y Mur, including 3 interiors: interior parade ground, bath house foundations, mansio (inn) site. Create your own photoreal reconstruction and explore every one, more scenes means more rooms, more angles, and more of the place to stand in.

Exterior approach from the grassy spurReconstructed 2nd-century curtain wallRampart/wall-top viewInterior parade groundBath house foundationsMansio (inn) siteSmall military amphitheatre (ludus)Possible temple siteNearby burial moundsAdjacent Sarn Helen road

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Recreate Tomen y Mur with AI to explore it.

The artist rebuilds it as it stood in 120, a photoreal reconstruction that belongs to you alone. Pay with coins, no subscription needed.

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Nearby

Landmarks within reach of Tomen y Mur.

Ffestiniog Railway, WalesMuseumFfestiniog Railway13 km awayMenai Suspension Bridge, WalesBridgeMenai Suspension Bridge36 km awayBritannia Bridge, WalesBridgeBritannia Bridge36 km away

Questions about Tomen y Mur

What is the history of Tomen y Mur?

Tomen y Mur began as a Roman auxiliary fort in the late 1st century AD, built during the North Wales campaigns of Gnaeus Julius Agricola. It was rebuilt in stone in the early 2nd century, occupied until about AD 140, and partly reused by the Normans for a motte in the 11th century.

What is inside Tomen y Mur?

Inside Tomen y Mur are an open grassy parade ground and traces of foundations, including a bath house and a mansio, or inn. The wider remains also include roads, burial mounds, a possible temple and a small military amphitheatre known as a ludus.

Why was Tomen y Mur built, and what was it used for?

Tomen y Mur was built as a Roman auxiliary fort to maintain Roman authority after Agricola's campaigns, oversee local populations and protect road communications. Its first earth-and-timber fort probably housed 1,000 mounted troops; after rebuilding in stone, it accommodated 500 infantry in a garrison role.

Where is Tomen y Mur?

Tomen y Mur is in Gwynedd, on the slope of an isolated spur northeast of Llyn Trawsfynydd. It stands beside the Roman road known as Sarn Helen, in the administrative area of Maentwrog.

When was Tomen y Mur built?

Tomen y Mur was first built in AD 78, placing its construction in the 1st century AD. It was rebuilt in stone in the early 2nd century, with the site's prime year given as 120.

What did Tomen y Mur look like in its prime?

In its prime, Tomen y Mur was a low, roughly rectangular Roman fort with squared stone curtain walls and earthwork banks. A reconstructed section of the 2nd-century curtain wall shows roughly dressed local stone blocks, while the interior formed an open grassy parade area on a spur above rolling pastures.

Is Tomen y Mur still standing, or is it a ruin?

Tomen y Mur is a partial ruin, but its earthworks survive along with a reconstructed section of the 2nd-century curtain wall. The site also retains traces of foundations, including the parade ground, bath house and mansio, while a later Norman motte remains within the fort's earthworks.

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