IMPERIUM (Ranger's Imperium Book 1)

The Sandarin Empire is faced with open rebellion from the Emperor's youngest brother. And as if that is not trouble enough a raging hoard of barbarians in alliance with the rebels have invaded the Empire from the North and are marching inland destroying and enslaving as they go.
Ragnarus, the second son of the late emperor, is the only one who has the fortitude and heart to gain new allies and try and regain the Empire. If he fails then the land of Sandar will be changed forever.