In AD 1071, the Byzantine Emperor, Romanos IV Diogenes, set out from Constantinople for the eastern borders of his Empire with an army described as "more numerous than the sands of the sea". His military campaign culminated in defeat by the Seljuk Sultan Alp Arslan at the Battle of Mantzikert. This defeat was to have profound consequences for both Byzantine and Turkish history and is still commemorated in the modern state of Turkey. Yet the historical...