Anglicans commemorate the martyr-ing of Archbishop Thomas Cranmer on 21 March, because in 1556 he was burned at the stake in Oxford.
A lot of the insurrectionists in England, also known as the leaders of the Reformation, were subject to rough treatment in those years, with tacit (and sometimes explicit) approval from Rome. Archbishop Cranmer had been on the good side of several monarchs -- 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.
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.
Mary I was Catholic, though, and when she took over the throne both loyalists to Rome and Church-of-England fans chose party over nation and stuck with their partisan identity politics, leading to a lot of unsavory episodes, including Cranmer deciding to recant his recantations and die a heretic by Roman standards so he could be a hero/martyr by Anglican standards.