The volume contains a new annotated critical edition with English translation of three major texts which shed light on the second phase of Byzantine iconoclasm (813-843) and the theological issues which continued to arouse interest in the subsequent centuries as the extant manuscripts indicate. The edition is accompanied by four interpretive essays on authenticity, style and language, the manuscript tradition and iconography. The study is a result of a concerted effort by a group of scholars and graduate students of the University of London Working Seminar on Editing Byzantine Texts.