Leaving at Cardiff a permanent garrison, the Romans pushed west and north. A Roman road was made to Gelligaer as a connecting link between the forts of Cardiff and Brecon. In addition to a fort at Gelligaer another was eventually built at Penydarren. Thence the road ran through Pontsarn and Vaynor to Y Gaer, near Brecon. On an Ordnance Survey map one can trace the line of the Roman road on Gelligaer common, where it is known as Heol Adam. The Roman road from the fort at Gelligaer lies just west of Fochriw and Pant-y-Waun.