In pre-Roman, and possibly Roman times, a part of southern Ceredigion was in the territory of the Demetae and possibly part of that of the Ordovices.
22.
Interestingly these regions show an approximate correspondence to the territories of the tribes later recorded in these areas by the Romans, the Silures, Demetae, Ordovices and Deceangli respectively.
23.
After much dispute, the next two periods of the Paleozoic era, the Ordovician and Silurian, were named after pre-Roman Celtic tribes of Wales, the Ordovices and Silures.
24.
It is the Roman campaigns of conquest that are most widely known, due to the spirited but unsuccessful defence of their homelands by two native tribes, the Silures and the Ordovices.
25.
In AD 60 or 61 the XX helped put down the revolt of queen Boudica, after having routed the Ordovices by crossing Menai Strait in Wales to destroy the Druids'sacred groves in 58.
26.
No other mention of the tribe appears in the historical records, but in view of the mountainous terrain of the lands of the Ordovices, it is questionable whether Agricola could have wiped out the entire population.
27.
After their deaths, Charles Lapworth erected the Ordovician system ( again named for an ancient tribe of northwest Wales, the Ordovices ), to account for the sequence of rocks at the heart of the controversy.
28.
Assaults on the Welsh tribes were made under the legate Publius Ostorius Scapula who attacked the Deceangli in 48 AD . They appear to have surrendered with little resistance, unlike the Silures and the Ordovices who put up a long and bitter resistance to Roman rule.
29.
When expansion into Wales resumed in 73, Roman progress was steady and successful under Sextus Julius Frontinus, who decisively defeated the Silures, followed by the success of Gnaeus Julius Agricola in defeating the Ordovices, and in completing the conquest of Anglesey in AD 77 78.
30.
As part of the Roman conquest of Britain, a series of campaigns to conquer Wales was launched by his successor in 48 and would continue intermittently under successive Roman era due to the spirited but unsuccessful defence of their homelands by two native tribes, the Silures and the Ordovices.
