The Ordovices Clan had no self-governing institutions and no Romanized capital. Therefor it its belived to have been under military government, possibly administrated from the fort at Caernarfon, overlooking the Isle of Anglesey across the Menai Straits.

Caratacus took refuge in the land of the Ordovices in c.50AD where he organised the resistance against Ostorius Scapula.

Frontinus established several garrison forts in Ordovician territory following his successful campaign against the Silures of South Wales; those in the upper Severn valley marking the line of penetration from Viroconium into North Wales are an example of his work.

Immediately before the governorship of Agricola, the Ordovices almost annihilated a regiment of Roman cavalry stationed in their territory. This may have taken place in the governorship of Frontinus, but there may have been a gap before the arrival of Agricola during which period, the destruction of the Ala took place.

Shortly after his arrival in Britain, Agricola took the Twentieth Legion into north Wales, massacred the Ordovices and conquered the stronghold of the druids on Mona in a single campaign in the late summer of 78AD. Agricola was legatus legionis XX under Cerialis, and he used this legion for this, his first campaign as provincial governor, probably because he knew the men and wanted every factor in his advantage.

The outcome of Agricola's campaign in AD78 was the near annihilation of the Ordovices, and the settlements did not recover until the third century.

Hope you dont mind me filling out the info on the Ordovices a bit! :)