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First of all, there is no "Roman Catholic Church", that is a slur, in English, from after the protestant revolt, to refer to the Catholic Church. Secondly, Thomas Cromwell was tried by Henry VIII on charges of heresy and treason, and executed by King Henry VIII, himself a heretic, and an apostate from the Catholic Church. The Catholic Church had nothing to do with Thomas Cromwell.
Thomas CromwellThe English statesman Thomas Cromwell, Earl of Essex (ca. 1485-1540), was the chief minister of Henry VIII from 1532 to 1540 and was largely responsible for revolutionary reforms in the English Church and in administration of the state.
Roman Catholic. Cromwell also supervised the Church of England from the unique post of Vicar General
They attacked statues, roods, and images, and dismantled the shrine of St Thomas Becket at Canterbury. He also set up one Bible in each church.
John Calvin
To get an answer to your question, you would have to specify what period of the Church you were looking at. There have been people reforming the Church in England for many centuries.
Was successful in reforming the church A+
Was successful in reforming the church A+
Erasmus advocated reforming the catholic church
Oliver cromwell came in and attacked the Irish rebels so protestant settlers could have peace as well as the protestant church
Oliver Cromwell
The Reformation was devoted to reforming the Catholic Church.