John Wyclif is best known as the originator of the first Bible in English, and as a theologian whose ideas anticipated the Reformation. This collection of essays is based on a series of lectures given in 1984 to celebrate his sexcentenary. It illustrates the full breadth of his achievements as the foremost thinker of medieval England, and to this end contributors from a wide range of specialities examine the importance of Wyclif in their own fields of history, philosophy, theology, and English language and literature. They might disagree about the interpretation of the fundamental doctrines of the Reformer but all would agree that Wyclif was a metaphysical thinker of compelling power, and a historical figure of far-reaching influence.