Sarn Helen

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A section of Sarn Helen near Betws-y-coed.

Sarn Helen was a Roman road in Wales, running from Aberconwy in the north to Carmarthen in the south.

It was some 160 miles in length. Today some sections are modern highways, others still traceable as Roman though much degraded, and at various places there is much debate as to where the road ran.

In the north the route is believed to follow the western bank of the river Conwy, passing through Trefriw, then leading on to Betws y Coed, with a branch leading to Caer Llugwy near Capel Curig. The route then passed through Dolwyddelan, running up Cwm Penanmen and past the higher parts of Cwm Penmachno. The route then leads on past Llan Ffestiniog to the Roman fort of Tomen y Mur, near Trawsfynydd before continuing south towards Dolgellau. In Ceredigion Sarn Helen runs as part of a B-road in Bronant, and six miles south there is a long stretch through the hamlet of Stag's Head.

Part of the narrow-gauge Corris Railway between Aberllefenni and Maespoeth Junction may run along the line of the Sarn, and the modern A487 trunk road between Corris and the Afon Dyfi may follow its route.

A further section of Roman road leading north-eastwards from Neath (Roman 'NIDVM') to Banwen at the southern edge of the Brecon Beacons National Park is known as Sarn Helen. It continues north-eastwards through the Park to the north-west of Ystradfellte, beneath Fan Frynych and then across Mynydd Illtud en route to the Roman fort of Y Gaer, Brecon (Roman 'CICVCIVM').

"Sarn Helen" is also the title of a song by Welsh band Super Furry Animals, named after the Roman road, appearing on their Welsh language album Mwng.