In 1204, the Byzantine Empire was conquered by troops from western Europe ostensibly taking part in the Fourth Crusade. This was a hugely significant event for the subjects of the Empire, radically altering the Byzantines' self-image and weakening their state for the later conflict with the Ottoman Turks. Using the theory of ethnicity - a comparatively recent tool with regard to the pre-modern era - Gill Page provides fresh insight into the late Byzantine period, providing a corrective to nationalistic interpretations of the period of Frankish rule and more broadly to generally held...