The individual books of the Bible, written out with an extensive gloss (medieval interpretations of the text, drawn from a variety of older sources), comprised some of the most widespread, numerous, and important manuscripts written in the 12th century. This copy of Mark has an inscription of a flyleaf which reads 'Lib Hug Epi.', a shortened form of the Latin for 'The Book of Bishop Hugh', followed by the date 1154. The flyleaf also has a shelfmark characteristic of Durham Cathedral, and the manuscript can be identified in the cathedral library catalogues, so 'Hugh' must be Hugh de Puiset, who was bishop of Durham from the end of 1153 until his death in 1195. In medieval manuscripts each book of the Bible was usually preceded by at least one preface: the initial 'M' on this page introduces the usual preface to Mark.