Centurion

Centurion was a military rank which was common in many cultures across the Alpha and Beta Quadrants. The rank is approximately equal to a Starfleet lieutenant commander. (TNG episode: "The Enemy")

The Romulan Star Empire used the rank of centurion. In 2266, an elderly centurion served as an advisor to Commander Keras on several campaigns, including his last fateful mission to attack several Earth outposts along the Romulan Neutral Zone. (TOS episode: "Balance of Terror")

While infiltrating a Romulan battle cruiser to obtain a cloaking device, James T. Kirk was disguised as a Romulan centurion. (TOS episode: "The Enterprise Incident")

Commander T'Shara, a leader of the Celesian campaign and wife of Praetor Hiren, was killed by one her centurions in 2379, when he mistook her for the enemy. (TNG movie novelization: Nemesis