Centurion

Centurion was a rank in Roman armies. An Auton duplicate of Rory Williams came to be known as "the Lone Centurion" and "the Last Centurion" after spending nearly two thousand years protecting the Pandorica. (TV: The Big Bang, A Good Man Goes to War)

The First Doctor and Vicki encountered a centurion on their way to Rome. (TV: The Romans)