Where was Valentia Province in Britannia ?

[romanonick]

On military activity north of the wall after 367 Moffatt mentions that Quintilius Clemens is 'ruler' of Strathclyde, Antonius Donatus the commander of the forces in 'south-west Scotland, Catellius Decianus the supreme authority of the northern Gododdin and Paternus Pesrut the commander of the southern Gododdin. He quotes 'northern genealogies' as the source material.
Were these people Dux appointees with the full remit of Rome ? It could explain why Moffat is keen on Valentia existing north of the Wall?
Thanks for all the other info.
Cheers.

Romanonick/Nick Deacon.