Hadrian's Wall in 198AD

[Nathan Ross]

I'd really like some advice on military organisation along Hadrian's Wall in 198AD

Hi Jenni

As far as we can tell, the organisation of the army on the wall remained fairly stable throughout the second century and into the third (aside from the disappearance of IX Hispana at some early point!)

Your best quick reference is probably this one: roman-britain.co.uk

If you look under the 'Military' bar you'll find info on all the various units and forts, most of it very detailed and (as far as I know) quite up to date.

was there a Legion in the north at that time and, if so, does anyone know which one?

Legion VI Victrix was based at York (Eboracum) throughout the second century, and on until some time in the fourth. Detachments of other legions appear in inscriptions, particularly at Corbridge and Carlisle, which probably had legionary garrisons for some or most of the period. II Augusta and XX Valeria Victrix are attested at both sites, I think.

were there still tribunes in the legions, or had the army already been reorganised?

Yes - five equestrian (angusticlave) tribunes and one senatorial (laticlave) tribune. The legion tribunes only seem to have disappeared in the later third century, when the old equestrian military cursus was phased out - but the timing and structure of this change remains pretty obscure, and it's quite possible that tribunes (perhaps no longer from the equestrian order, although even centurions seem to have gained this status after Severus!) remained in the older legions based on the frontiers for much longer.