On October 31, 1517. Martin Luther, a 33-year-old theology professor at Wittenberg University walked over to the Castle Church in Wittenberg and nailed a paper of 95 theses to the door, hoping to spark an academic discussion about their contents. It became a key event in igniting the Reformation.
Jan Hus (1369 – 6 July 1415), often referred to in English as John Huss, was a Czech priest, philosopher, early Christian reformer and Master at Charles University in Prague. After John Wycliffe, the theorist of ecclesiastical Reformation, Hus is considered the first Church reformer, as he lived before Luther, Calvin and Zwingli. Hus was a key predecessor to the Protestant movement of the sixteenth century, and his teachings had a strong influence on the states of Europe.
John Calvin (1509–1564) was an influential French theologian and pastor during the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism. John Calvin was Martin Luther's successor as the preeminent Protestant theologian. Calvin made a powerful impact on the fundamental doctrines of Protestantism, and is widely credited as the most important figure in the second generation of the Protestant Reformation.