Waun-Ddu Roman fortlet
The soldiers stationed at Waun-Ddu quite possibly enjoyed similar panoramic mountain views to those we see today.
The Roman fortlet of Waun-Ddu was a far more permanent-looking structure than the marching camps and would have been manned by between 20-30 auxiliaries at any one time.
It is thought to have been built over 50 years after Y Pigwn, in the second century AD, by which time the Roman conquest of Wales was complete, with a series of forts, fortlets and roads strategically placed to control important locations and route ways.
By the second century AD the track across the Mynydd Bach Trecastell had become a busy and important trading route linking Brecon to Llandovery. This route required a fortlet to guard and maintain it.