An ageing Romulan officer aboard the Bird-of-Prey that raids the Neutral Zone outposts in 2266, a trusted old comrade of its Commander who dies during the duel with the Enterprise.
The Centurion appears in the first-season episode Balance of Terror. He has served with the Commander through many campaigns, and is the one person aboard to whom the Commander can admit his weariness of war and his doubts about the mission.
He in turn warns his friend to be careful of the ambitious young officer Decius, who has powerful connections at home and has already been reprimanded for breaking silence.
When the Enterprise's phasers shake the Romulan ship, the Centurion pushes the Commander clear of falling wreckage and is mortally hurt. The Commander has his body ejected with other debris to make the Enterprise think the ship destroyed, a ruse he plainly hates. The Centurion was played by John Warburton.