Sometimes dubbed the last great medieval theologian, Thomas Netter was a Carmelite friar from Saffron Walden in England. By the time of his death in 1430, his writings on theology, philosophy, Canon Law and Scripture had travelled across the Christian world, and a cult of sanctity quickly developed at the tomb of ¿blessed Thomas¿ in the French city of Rouen. Netter¿s life and writings give an insight into the political, intellectual, and ecclesiastical complexities of late medieval Europe. As a participant at the Councils of Pisa and Constance and as a diplomat and confessor for the house of Lancaster, Netter enjoyed great spiritual and political influence. Thomas Netter played a prominent role in heresy debates and trials, refuting Wyclif, Hus, and their adherents by preaching against Lollardy and by writing the Doctrinale antiquitatum fidei eccleaisæ catholicæ, a magisterial apologia of Catholic dogma which dominated Western Christian teaching for centuries. A scanned copy of the Doctrinale is appended to this, the fourth volume of the Carmel in Britain series, in which scholars from the Carmelite Order and the wider academic community interpret the impact of Thomas Netter on his contemporaries, and his enduring influence