Thomas Cranmer (1489–1556) was an influential English theologian and a central figure in the English Reformation. Serving as the Archbishop of Canterbury from 1533 to 1555, he played a vital role in the separation of the English Church from the Roman Catholic Church. He provided theological support for King Henry VIII's annulment from Catherine of Aragon and later established the liturgical foundations of the reformed Church of England. Recognized as a saint and martyr, his liturgical contributions shaped the religious identity of the Anglican tradition.