This volume, along with Volume V, completes the edition of the long English Wycliffite sermon cycle and two related tracts; the first three volumes, published in 1983, 1987 and 1990, contained the texts of the 294 sermons, together with variants and some introductory material. This volume contains a review of the evidence concerning the date, authorship and audience of the sermons, followed by a survey of the main polemical issues repeatedly under discussion in the sermons and by a commentary on the text, which is continued in Volume V. The material here, along with the introductions to the three text volumes, will enable scholars to assess the background and importance of this extensive body of vernacular preaching. In particular, the discussion traces the large debt of the sermons to a wide range of Wyclif's own Latin works, and shows their relationship to other works of the Wycliffite movement.