On the basis of a thorough philological-linguistic study, the book aims primarily at reintegrating the complex whole of the various phenomena that have contributed to creating what in modern scholarship runs under the name of Christian Sogdian Gospel Lectionary E5, a set of manuscript fragments preserved in the Turfan Collection in Berlin. The study applies a precise methodology that puts various disciplinary approaches on the same level in order to relate and interconnect textual, material and historical-cultural aspects. Specific codicological characteristics are considered in correlation with the broader manuscript tradition to which the fragments belong. The discussion of the Gospel lectionary leads to reflections on the transmission, reception and development of a specific body of religious knowledge, namely that of the Church of the East. The exploration of linguistic phenomena takes also into consideration the processes at work in the missionary history of the Church of the East in Central Asia between Late Antiquity and the early Middle Ages in the Oasis of Turfan in present-day Xinjiang, China. The book therefore addresses Iranologists as well as students of Eastern Christianity and of manuscript cultures.