MS 42 is a compilation of saints' lives made at the Benedictine priory of Dover dating to the second quarter of the twelfth century. Its provenance is given by the typical Dover arrangement of two classmark- and contents-inscriptions, one on the opening page and one further on in the book; the classmark matches these up to an entry in the Dover catalogue of 1389 which gives the opening words of the page on which the second inscription occurs. We can be fairly certain that it was originally written at Dover because the same hand also occurs in another Dover manuscript, CCCC MS 462. The manuscript contains hagiographical texts, starting with the standard life of Martin of Tours, the epitome of a bishop saint. Two of the lives included are of very important English saints, Edmund king and martyr and Dunstan, archbishop of Canterbury. It also contains an unusual collection of miracles of the Virgin Mary, and an incomplete legendary with some musical notation.