The volume covers several topics connected to the Christian mediaeval traditions, both Eastern (Byzantine, Slavic, Coptic, Armenian) and Western, including intertestamentary traditions and the reception of biblical and mediaeval heritage in the modern epoch. Several documents are published for the first time. Among them are Byzantine historia animae utilis BHG 1277a, an anonymous 9th-century Byzantine treatise in defense of the holy icons, the Slavonic version of a previously unknown Vita of St. Empress Theophano, which is lost in Greek original, and a 13th-century charter from the Monk Bretton Priory in Yorkshire. Several papers are dedicated to heortology and hymnography, especially in the Byzantium and Slavic world (among them, an exhaustive dossier of the earliest Byzantine service menaia available either directly or in Slavonic and Oriental versions), but also presented is an ample dossier of Yezidi religious poetry (containing publications of the texts collected by the author). Cross-cultural studies include such topics as the cult of St Gregory of Armenia in Constantinople, the Roman See’s relations with Korea in the 14th century, and the cult of the martyrs Varangians in the early Christian Kiev. The linguistic studies are dedicated to the Church Slavonic/Old Russian lexicography.