Thomas Cranmer. Thomas Cranmer was a leader of the English Reformation and Archbishop of Canterbury during the reigns of Henry VIII, Edward VI and, for a short time, Mary I. He helped build the case for the annulment of Henry's marriage to Catherine of Aragon, which was one of the causes of the separation of the English Church from union with the Holy See.
Along with Thomas Cromwell, he supported the principle of Royal Supremacy, in which the king was considered sovereign over the Church within his realm. During Cranmer's tenure as Archbishop of Canterbury, he was responsible for establishing the first doctrinal and liturgical structures of the reformed Church of England.
Under Henry's rule, Cranmer did not make many radical changes in the Church, due to power struggles between religious conservatives and reformers. However, he succeeded in publishing the first officially authorised vernacular service, the Exhortation and Litany.
When Edward came to the throne, Cranmer was able to promote major reforms. He wrote and compiled the first two editions of the Book of Common Prayer, a complete liturgy for the English Church.
With the assistance of several Continental reformers to whom he gave refuge, he changed doctrine or discipline in areas such as the Eucharist, clerical celibacy, the role of images in places of worship, and the veneration of saints. Cranmer promulgated the new doctrines through