Dr Vlasto reviews the early history of the various Slav peoples (from about AD 500 onwards) and traces their gradual emergence as Christian states within the framework of either West or East European culture. Special attention is paid to the political and cultural rivalry between East and West for the allegiance of certain Slav peoples, and to the degree of cultural exchange within the Slav world, associated in particular with the use of the Slav liturgical language. His examination of all the Slav peoples and extensive use of original source material in many different languages enables Dr Vlasto to give a particularly comprehensive study of the subject.