pilus before 185 CE (in the inscription these nicknames are missing). Praepositus of the Misenum fleet Castus next acted as Provost (Praepositus) of the Misenum fleet in Italy. This title (generally given to Equites) indicated a special command over a body of troops, but somewhat limited in action and subject to the Emperor's control. Praefectus of Legio VI Victrix The Legio VI Victrix was based in Britain from c. 122 AD onward, though their history during the 3rd century AD is rather hazy. Throughout the 2nd century AD and into the 3rd, the headquarters of the VI Victrix was at Eboracum (modern York). The unit was removed briefly to Lugdunum (Lyons) in 196 AD by Clodius Albinus, during his doomed revolt against the emperor Severus, but returned to York after the revolt was quelled – and the unit suffered a significant defeat – in 197 AD. Castus's position in the Legio VI Victrix, Prefect of the Legion (Praefectus Legionis), was equivalent to that of the Praefectus Castrorum. Men who had achieved this title were normally 50–60 years old and had been in the army most of their lives, working their way up through the lower ranks and the centurionate until they reached Primus Pilus (the rank seems to have been held exclusively by primipilares ). They acted as third-in-command to the legionary commander, the legatus legionis, and senior tribune and could assume command in their absence.Webster, p. 113. Their day-to-day duties included maintenance of the fortress and management of the food supplies, sanitation, munitions, equipment, etc.Keppie (1998), p. 177. For most who had attained this rank, it would be their last before retirement. During battles, the Praefectus Castrorum normally remained at the unit's home base with the reserve troops, so, given his administrative position and (probably) advanced age, it is unlikely that Castus actually fought in any battles while serving in Britain. Castus could have overseen vexillations of troops guarding Hadrian's Wall, but his inscriptions do not provide us with any precise information on where he might have served while in Britain. Given his duties as Praefectus Legionis, it is reasonable to assume that he spent some – if not all – of his time in Britain at the VI Victrix's headquarters in York. It is interesting that the title is spelled (P)RAEFF on Castus's sarcophagus – doubled letters at the end of abbreviated words on Latin inscriptions usually indicated