Cranmer's career is a study in the position of a churchman under a monarch who controls the church. He was raised to Canterbury in 1533 in order to pronounce Henry's first marriage void, and did so within months. He kept a wife, secretly, at a time when clerical marriage was illegal in England, sending her abroad when the law tightened. He served Henry, then Edward VI, under whom the reforms he wanted were possible, and then Mary I, under whom they were not.
Arrested after Mary's accession, he was tried first for treason and then for heresy, held for two years, and worn down. He signed a succession of recantations, each going further than the last, until the final one repudiated the Reformation entirely and accepted papal supremacy. That should have saved him under the usual practice, and it did not: the decision to burn him had been taken regardless.
At the University Church in Oxford in March 1556, given a last opportunity to confirm his submission before the crowd, he repudiated the recantations instead, said that the hand which had written contrary to his heart should be punished first, and was pulled from the pulpit and taken to the stake, where he is said to have held his right hand steadily in the flame.
The account comes principally from John Foxe, writing as a partisan within a few years, and the atlas notes that the source is a martyrology rather than a neutral record while also noting that its outline is not seriously disputed.