The remains of the Roman fort named Mancunium date from AD79 and can be found at Castlefield in Manchester.
Caer Leb is a rectangular shaped earthwork with double banks and ditches. It measures approximately two hundred feet by one hundred and sixty feet, so it is quite a large site. A 3rd Century brooch and a 4th Century denarius along with some Roman pottery and Iron Age quern stones have been found at Caer Leb.
There is much speculation over the age and use of Castell Bryn Gwyn (White Hill Castle). It was not a hillfort, being built on flat land, but excavations in 1959-1960 discovered that the rampart and ditch were similar to hillfort defences. It may have been a Neolithic henge monument, but nevertheless, there has been a long history of occupation at the site.
Saint Cybi was said to be the cousin of Saint David (~500- 1st March 589AD, there is uncertainty to the dates), the Patron Saint of Wales, and the friend of Saint Seiriol who founded his cell at Penmon on Ynys Môn (Anglesey) with whom he would regularly meet.
Taking the B4391 towards Bala from Llan Ffestiniog for just over a mile, you pass close to an Iron Age hillfort situated in rough moorland known as Bryn-y-Castell. The site was excavated by students from Plas Tan-y-Bwlch (Maentwrog) between 1979 and 1985, and it was found to be an important site for iron production until the arrival of the Romans in North Wales when it was abandoned.
Caer-y-Twr is the remains of an Iron Age hill fort on the summit of Holyhead mountain (Mynydd Twr) 220 metres in height. Due to its position, it did not need much additional defence, but it had a stone rampart on the northern and eastern sides enclosing an area of roughly seven hectares. The site of the hill fort now contains mostly rubble, but the walls can still be identified.
This is the remains of a Roman auxiliary fort, one of the largest, and last to be abandoned by the Romans in North Wales. It was built by Gnaeus Julius Agricola in around 77 AD after his victory over the native tribe, the Ordovices.
Tomen-y-Mur (translated as ‘Mound in the Walls’) was originally an ancient Roman fort on the slope of Mynydd Maentwrog to the north east of Llyn Trawsfynyedd, with access from A470 although it is not signposted.
On a popular walking route for ramblers and hikers, from Cwm Bychan through Bwlch Tyddiad and around Rhinog Fawr, you will encounter the Roman Steps. These steps made in the hills are commonly said to have been constructed by the Romans to facilitate the ascent and descent of their sentries to and from the pass of Bwlch Tyddiad (1,294 ft and 7.5 miles out of Llanbedr).