By the middle of the 5th Century the Roman Empire was on the verge of collapse. Its emperors were mere puppets, its armies were in chaos, and enemies were closing in on all sides. Unable to sustain itself, the West collapsed, plunging Europe into the Dark Ages. By all accounts, the East should have followed suit, and yet, unexpectedly, the Eastern emperor slipped free of his barbarian master and saved the tottering state. Join Lars Brownworth as he looks at Zeno, the unlikely savior of the Byzantine Empire.