Note 179 — BOOK I (continued 2)

The meaning of the title praefectus legionis is doubtful. It seems most likely to mean the same as praefectus castrorum, an officer who superintended the camp and sometimes acted as second-in-command (cp. ii. 89). The post was one to which senior centurions could rise. At this period they were not attached to a legion, but to a camp, where more than one legion might be quartered. That makes the phrase here used curious. The legion is that of the marines now stationed in Rome (cp. chaps. 6 and 9). They appear to have joined the mutinous Seventeenth cohort when they reached the city.