Legend tells of the Lone Centurion - a mysterious figure dressed as a Roman soldier who stood guard over the Pandorica, warning off those who would attempt to open it; a constant warrior whose story appeared in the folk history of a dozen civilisations.
Only... he seems to have misplaced it.
Travelling to Rome in search of the Pandorica, Rory finds himself forced to perform as a gladiator in the Colosseum... where he attracts the attention of the Imperial household.
1.1 Gladiator by David Llewellyn
1.2 The Unwilling Assassin by Sarah Ward
1.3 I, Rorius by Jacqueline Rayner
More story details to follow.