Two inscriptions found in Ostia attest to Calpurnianus present in that city as pontifex Volcani in the years 194 and 195.
A fragmentary inscription from Rome attests that after serving as praetor he officially served as juridicus in Britain when he had to replace an unnamed consular, then after his election to the quindecimviri sacris faciundis the sortition awarded him the office of proconsular governor of Macedonia.
Birley notes that most experts date Calpurnianus' tenure as acting governor to about 200 "on the death or sudden disappearance of Virius Lupus.
[2] Birley lists two or three other incidents around 185 when the legions in Britain attempted to make different legionary commanders emperor.
Birley speculates that he "preferred to devote himself to his private or local concerns, for example at Ostia, which was presumably his home.