Looking for info on Trajan between 96-98 AD

[Gunthamund Hasding]

Well Germania Superior had the biggest army close to Rome at that time, I think there were at least 3 legions
Legio VIII Augusta Argentorate (modern Strasbourg)
Legio XI Claudia Pia Fidelis Vindonissa (modern Windisch)
Legio XXII Primigenia Mogontiacum (modern Mainz)
and some auxiliaries arround (30to35k soldiers I would say)

link with legions at Lvius
http://www.livius.org/le-lh/legio/legions-geo.html

on Casperius Aelianus, according to Dio Cassius he was called to Mainz and executed, see Dio link above (Cassius Dio 68,5,2.)