The years 1517–1525 were the most tumultuous of Luther’s career. They saw his emergence from obscurity to become a figure of international controversy and national renown as the controversy over indulgences exploded, with far-reaching ecclesiastical and political consequences. He emerged as a master—if not practically the creator—of the popular press, dominating German vernacular printing with a flood of treatises and the publication of his German New Testament in 1522. These years were the crucible in which Luther’s theology was shaped into its mature form through conflict not only with supporters of the papacy and of scholasticism but also with former colleagues and sympathizers. By 1525 Luther’s theology had established itself as a movement and distinguished itself from other versions of reform.