Llanddoged is a small village which lies in the hills a little over a mile to the north of Llanrwst, in Conwy county borough, Wales.

It has a primary school, Ysgol Llanddoged, and education is delivered through the medium of Welsh.

[citation needed] There is also a small playground park and playing field, known as 'Cae Cetyn'.

A Roman road passes close to Llanddoged, indicated by the nearby place-name: 'Sarn Ddu' shown on the map as the name of the local sewage works.

Sarn is also used to indicate defences against water (flood, tide) where these, like Roman roads, involve significant built-up lines of layers of stones.

A possible route on which this may stand is a NNW-SSE road starting close to the edge of the east bank of Afon Conwy, just SE of the Tan-yr-Allt building in Coed Bortho, facing the confirmed Roman fort at Caerhun, suggesting this road may have been to a Ferry or ford.

Another possible route is a WSW-ENE road the route of which may run close to the nearby Caer Faban, another unconfirmed possible Roman site, in which case Llanddoged / Sarn Ddu may stand in the vicinity of Roman crossroads.