Protestant Reformers were those theologians whose careers, works and actions brought about the Protestant Reformation of the 16th century. In the context of the Reformation, Martin Luther was the first reformer (sharing his views publicly in 1517), followed by people like Andreas Karlstadt and Philip Melanchthon at Wittenberg, who promptly joined the new movement. In 1519, Huldrych Zwingli became the first reformer to express a form of the Reformed tradition. Listed are the most influential reformers only. They are listed by movement, although some reformers (e.g. Martin Bucer) influenced multiple movements. Notable precursors According to Edmund Hamer Broadbent, throughout the Middle Ages, there were a number of Christian movements that sought a return to what they perceived as the purity of the Apostolic church and whose teachings foreshadowed Protestant ideas. Claudius of Turin Gottschalk of Orbais Berengar of Tours Peter Waldo Lorenzo Valla Wessel Gansfort Girolamo Savonarola Jacques Lefèvre d'Étaples John Wycliffe Jan Hus Magisterial Reformers There were a number of key reformers within the Magisterial Reformation, including: Lutheran Martin Luther Philipp Melanchthon Justus Jonas Martin Chemnitz Georg Spalatin Joachim Westphal Andreas Osiander Johannes Brenz Johannes Bugenhagen Andreas Karlstadt, later a Radical Reformer Hans Tausen Mikael Agricola Primož Trubar Jiří Třanovský Reformed Huldrych Zwingli Martin Bucer John Calvin Heinrich Bullinger Theodore Beza William Farel John Knox Wolfgang Capito Johannes Oecolampadius Peter Martyr Vermigli Leo Jud Anglican Thomas Cranmer Thomas Cromwell Matthew Parker William Tyndale Hugh Latimer Richard Hooker Arminian Jacobus Arminius Unitarian Ferenc Dávid Radical Reformers Important reformers of the Radical Reformation included: Anabaptist Thomas Müntzer Zwickau prophets John of Leiden Menno Simons Dirk Willems Schwenkfelder Kaspar Schwenkfeld Second Front Reformers There were also a number of people who initially cooperated with the Radical Reformers, but separated from them to form a "Second Front", principally in objection to sacralism. Among these were: Anabaptist Johannes Bünderlin Hans Denck Christian Entfelder Conrad Grebel Balthasar Hubmaier Felix Manz Counter Reformers Roman Catholics who worked against the Protestant Reformation included: Roman Catholic Girolamo Aleandro Augustine Alveld Thomas Cajetan Johann Cochlaeus Johann Eck Jerome Emser Pope Leo X John Tetzel Thomas More Ignatius Loyola Francis de Sales Pope Paul III Pope Pius V Charles Borromeo Francis Xavier Peter Faber Diego Laynez See also List of Protestant Reformers (alphabetical) Protestantism in Germany References Further reading George, Timothy. Theology of the Reformers. Nashville, Tenn.: Broadman Press, 1988. . N.B.: Comparative studies of the various leaders of the