Soldier of Rome: The Sacrovir Revolt - The Artorian Chronicles, #2

It has been three years since the wars against Arminius and the Cherusci. Gaius Silius, Legate of the Twentieth Legion, is concerned that the barbarians-though shattered by the war-may be stirring once again. He also seeks to confirm the rumors regarding Arminius' death. What Silius does not realize is that there is a new threat to the Empire, but it does not come from beyond the frontier; it is coming from within, where a disenchanted nobleman looks to sow the seeds of rebellion in Gaul.
Legionary Artorius has greatly matured during his five years in the legions. He has become stronger in mind; his body growing even more powerful. Like the rest of the Legion, he is unaware of the shadow growing well within the Empire's borders, where a disaffected nobleman seeks to betray the Emperor Tiberius. A shadow looms; one that looks to envelope the province of Gaul as well as the Rhine legions.
The year is A. D. 20.