AD 1068: the armies of the Seljuk Sultanate tear at Byzantium's borders, poised to strike the death blow that will bring all Anatolia under their yoke. Alp Arslan's armies grow stronger with every passing season, while the beleaguered Byzantine soldiers defend for their lives, the hope in their hearts guttering its last.

In 1071 AD, Emperor Romanus Diogenes has rekindled the guttering flame of Byzantium. Yet in the eastern borderlands, two vital strongholds hang in the balance. Manzikert and Chliat must be won to secure the empire's fragile frontiers and vanquish the would-be usurpers who covet the imperial throne. But Sultan Alp Arslan and his vast Seljuk armies look to those twin fortress-towns also, resolute on seizing them first.

AD 377: Numerius Vitellius Pavo and the men of the XI Claudia return to Constantinople from their brutal Persian sortie to hear widespread tales of Thracia’s plight and the precarious mountain blockades. Each of them knows what is at stake should those passes fall: the heartland of the Eastern Empire would face the wrath of the barbarians and loved ones would be at the mercy of their savage blades.

376 AD: The Eastern Roman Empire is alone against the tide of barbarians swelling on her borders. Emperor Valens juggles the paltry border defenses to stave off invasion from the Goths north of the Danube. Meanwhile, in Constantinople, a pact between faith and politics spawns a lethal plot that will bring the dark and massive hordes from the east crashing down on these struggling borders. The fates conspire to see Numerius Vitellius Pavo, enslaved as a boy after the death of his legionary father, thrust into the limitanei, the border legions, just before they are sent to recapture the long-lost eastern Kingdom of Bosporus.

Deep winter, AD 376: Emperor Valens has withdrawn the field armies from Moesia and Thracia to fight in the Persian War. The impoverished limitanei legions left behind to defend the banks of the River Danubius are now all that stand between the war-hungry Goths and heart of the Eastern Roman Empire.