Failure of Empire is the first comprehensive biography of the Roman emperor Valens and his troubled reign (a.d. 364-78). Valens will always be remembered for his spectacular defeat and death at the hands of the Goths in the Battle of Adrianople. This singular misfortune won him a front-row seat among history's great losers. By the time he was killed, his empire had been coming unglued for several years: the Goths had overrun the Balkans; Persians, Isaurians, and Saracens were threatening...