In October 1307 all the brothers of the military religious Order of the Temple in France were arrested on the instructions of King Philip IV and charged with heresy. In November, Pope Clement V instructed King Edward II of England to do likewise. This volume provides the first full edition of the four surviving texts of the trial proceedings that followed in Britain and Ireland; volume 2 supplies the translations into English. The trial of the Templars was the first major heresy trial in the British Isles, and the proceedings reveal the Episcopate's attempts to deal with this unprecedented situation, the varying procedures followed in different countries, and how testimonies were recorded and summarised for the Church Councils which eventually decided the fate of the Order of the Temple. The testimonies given during the trial contain a wealth of information about religious beliefs among the lay population of the British Isles (both the Templars and outsiders who gave evidence during the trial), national and international mobility of lay religious, the social function of the order of the Temple in the British Isles and its relations with society at large, and the organisation and operations of the Order of the Temple at a local, national and international level. Detailed introductions to each volume describe the manuscripts and how the material was compiled and arranged, and discuss the course of the proceedings and the value of the evidence they contain. Appendices in volume 2 (the translation) list the names of all the Templars mentioned during the proceedings, Templar houses and the locations of the proceedings in London.