8THERE WERE 12 MAJOR RANKS FOR ROMAN MILITARY OFFICERS

The highest military rank a Roman could reach was legatus augusti proparetore, the military governor of a province of the empire.

The legion was the largest unit of the Roman army. The single, long-term commander for each legion was legatus legionis. The tribunus laticlavius was the second-in-command of a legion while praefectus castrorum was the third-in-command. The basic battlefield unit of a legion was a cohort composed of six centuries. The cohort was commanded by pilus prior, who was also the commander of the senior century in the legion. A century in the legion was commanded by a centurion. Each centurion had under his command three principales: optio, his second-in-command; signifer, the standard bearer; and tesserarius, the guard commander for the century.

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